Tag: Olfactory_system

adult antennal lobe projection neuron DL5 [FBbt_00059280]

[transmission electron microscopy (TEM); focussed ion beam scanning electron microscopy (FIB-SEM); adult olfactory projection neuron; antennal lobe glomerulus DL5; adult uniglomerular antennal lobe projection neuron; Uniglomerular mALT DL5 lvPN#R1 (FAFB:57216); JRC2018Unisex; JRC_FlyEM_Hemibrain; Uniglomerular mALT DL5 adPN#L1 (FAFB:1992); receives synaptic input throughout; adult antennal lobe projection neuron DL5; Uniglomerular mALT DL5 adPN#R1 (FAFB:39668); DL5_adPN_R (FlyEM-HB:693483018)]

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adult fruitless aSP-g1 (female) neuron [FBbt_00049330]

Adult fruitless neuron of the female aSP-g cluster belonging to a morphological subtype with relatively anterior dendritic arborization (Taisz et al., 2023). It is a lateral horn output neuron that fasciculates with the AD1 primary neurite tract (Frechter et al., 2019; Dolan et al., 2019; Bates et al., 2020). There are around three of these cells per hemisphere (Taisz et al., 2023) and they are cholinergic (Dolan et al., 2019; Bates et al., 2020).

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adult fruitless aSP-g2 (female) neuron [FBbt_00051555]

Adult fruitless neuron of the female aSP-g cluster belonging to a morphological subtype with dendritic arborization between the aSP-g1 and aSP-g3 groups on the anterior-posterior axis (Taisz et al., 2023). It is a lateral horn neuron that fasciculates with the AD1 primary neurite tract (Schlegel et al., 2021). It has a greater proportion of its dendritic arbor in the lateral horn than other female aSP-g neurons (Taisz et al., 2023). These cells receive input from projection neurons that receive input in antennal lobe glomerulus DA1 and they respond to the male sex pheromone cVA (Kohl et al., 2013; Taisz et al., 2023). There are around 3-5 of these cells per hemisphere (Taisz et al., 2023).

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AL-AST1 [FBbt_00047928]

Unilateral, multiglomerular antennal lobe AST-associated neuron that forms both glomerular and non-glomerular arborizations within the antennal lobe (Tanaka et al., 2012). It receives input from pheromone-sensitive neurons in glomeruli DA1 and VA1v and has outputs in other glomeruli (Schlegel et al., 2021). It also projects to the gnathal ganglion and the lateral accessory lobe (Tanaka et al., 2012), having substantial output to the saddle (Schlegel et al., 2021). There is one of these cells per hemisphere, with its cell body ventrolateral to the antennal lobe (Tanaka et al., 2012).

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aSP-g1_L#1 (FAFB:1064888) [VFB_00102dvc]

aSP-g1_L#1, FBbt:00049330 [VFB CATMAID Adult Brain (FAFB); adult brain; EM FAFB Taisz and Galili et al., 2022; adult fruitless aSP-g1 (female) neuron; JRC2018Unisex; is part of; aSP-g1_L#1 (FAFB:1064888); female organism; CC-BY-SA_4.0; transmission electron microscopy (TEM)]

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aSP-g1_L#2 (FAFB:1100594) [VFB_00102dvi]

aSP-g1_L#2, FBbt:00049330 [VFB CATMAID Adult Brain (FAFB); adult brain; EM FAFB Taisz and Galili et al., 2022; aSP-g1_L#2 (FAFB:1100594); adult fruitless aSP-g1 (female) neuron; JRC2018Unisex; is part of; female organism; CC-BY-SA_4.0; transmission electron microscopy (TEM)]

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aSP-g1_L#3 (FAFB:1101176) [VFB_00102dvj]

aSP-g1_L#3, FBbt:00049330 [VFB CATMAID Adult Brain (FAFB); adult brain; EM FAFB Taisz and Galili et al., 2022; adult fruitless aSP-g1 (female) neuron; CC-BY-SA_4.0; JRC2018Unisex; is part of; female organism; aSP-g1_L#3 (FAFB:1101176); transmission electron microscopy (TEM)]

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aSP-g1_R#1 (FAFB:1070581) [VFB_00102dvd]

aSP-g1_R#1, FBbt:00049330 [VFB CATMAID Adult Brain (FAFB); adult brain; EM FAFB Taisz and Galili et al., 2022; aSP-g1_R#1 (FAFB:1070581); adult fruitless aSP-g1 (female) neuron; JRC2018Unisex; is part of; female organism; CC-BY-SA_4.0; transmission electron microscopy (TEM)]

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aSP-g1_R#2 (FAFB:1074687) [VFB_00102dve]

aSP-g1_R#2, FBbt:00049330 [VFB CATMAID Adult Brain (FAFB); adult brain; EM FAFB Taisz and Galili et al., 2022; adult fruitless aSP-g1 (female) neuron; aSP-g1_R#2 (FAFB:1074687); JRC2018Unisex; is part of; female organism; CC-BY-SA_4.0; transmission electron microscopy (TEM)]

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aSP-g1_R#3 (FAFB:1079881) [VFB_00102dvf]

aSP-g1_R#3, FBbt:00049330 [VFB CATMAID Adult Brain (FAFB); adult brain; EM FAFB Taisz and Galili et al., 2022; adult fruitless aSP-g1 (female) neuron; aSP-g1_R#3 (FAFB:1079881); JRC2018Unisex; is part of; female organism; CC-BY-SA_4.0; transmission electron microscopy (TEM)]

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aSP-g1_R#4 (FAFB:1083904) [VFB_00102dvg]

aSP-g1_R#4, FBbt:00049330 [VFB CATMAID Adult Brain (FAFB); adult brain; EM FAFB Taisz and Galili et al., 2022; adult fruitless aSP-g1 (female) neuron; JRC2018Unisex; is part of; female organism; CC-BY-SA_4.0; aSP-g1_R#4 (FAFB:1083904); transmission electron microscopy (TEM)]

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aSP-g2_L#1 (FAFB:1055936) [VFB_00102dv8]

aSP-g2_L#1, FBbt:00051555 [VFB CATMAID Adult Brain (FAFB); adult brain; EM FAFB Taisz and Galili et al., 2022; JRC2018Unisex; adult fruitless aSP-g2 (female) neuron; is part of; aSP-g2_L#1 (FAFB:1055936); female organism; CC-BY-SA_4.0; transmission electron microscopy (TEM)]

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aSP-g2_L#2 (FAFB:1064687) [VFB_00102dva]

aSP-g2_L#2, FBbt:00051555 [VFB CATMAID Adult Brain (FAFB); adult brain; aSP-g2_L#2 (FAFB:1064687); EM FAFB Taisz and Galili et al., 2022; JRC2018Unisex; adult fruitless aSP-g2 (female) neuron; is part of; female organism; CC-BY-SA_4.0; transmission electron microscopy (TEM)]

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aSP-g2_L#3 (FAFB:7899781) [VFB_00102dwa]

aSP-g2_L#3, FBbt:00051555 [VFB CATMAID Adult Brain (FAFB); adult brain; EM FAFB Taisz and Galili et al., 2022; JRC2018Unisex; adult fruitless aSP-g2 (female) neuron; is part of; aSP-g2_L#3 (FAFB:7899781); female organism; CC-BY-SA_4.0; transmission electron microscopy (TEM)]

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aSP-g2_L#4 (FAFB:7918690) [VFB_00102dwb]

aSP-g2_L#4, FBbt:00051555 [VFB CATMAID Adult Brain (FAFB); adult brain; EM FAFB Taisz and Galili et al., 2022; JRC2018Unisex; adult fruitless aSP-g2 (female) neuron; is part of; female organism; aSP-g2_L#4 (FAFB:7918690); CC-BY-SA_4.0; transmission electron microscopy (TEM)]

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aSP-g2_L#5 (FAFB:534333) [VFB_00102dv7]

aSP-g2_L#5, FBbt:00051555 [VFB CATMAID Adult Brain (FAFB); adult brain; EM FAFB Taisz and Galili et al., 2022; JRC2018Unisex; adult fruitless aSP-g2 (female) neuron; is part of; aSP-g2_L#5 (FAFB:534333); female organism; CC-BY-SA_4.0; transmission electron microscopy (TEM)]

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aSP-g2_R#1 (FAFB:1064853) [VFB_00102dvb]

aSP-g2_R#1, FBbt:00051555 [aSP-g2_R#1 (FAFB:1064853); VFB CATMAID Adult Brain (FAFB); adult brain; EM FAFB Taisz and Galili et al., 2022; JRC2018Unisex; adult fruitless aSP-g2 (female) neuron; is part of; female organism; CC-BY-SA_4.0; transmission electron microscopy (TEM)]

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aSP-g2_R#2 (FAFB:1086385) [VFB_00102dvh]

aSP-g2_R#2, FBbt:00051555 [VFB CATMAID Adult Brain (FAFB); adult brain; EM FAFB Taisz and Galili et al., 2022; JRC2018Unisex; adult fruitless aSP-g2 (female) neuron; is part of; female organism; aSP-g2_R#2 (FAFB:1086385); CC-BY-SA_4.0; transmission electron microscopy (TEM)]

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aSP-g3_L#1 (FAFB:7856299) [VFB_00102dw9]

aSP-g3_L#1 [VFB CATMAID Adult Brain (FAFB); adult brain; aSP-g3_L#1 (FAFB:7856299); EM FAFB Taisz and Galili et al., 2022; adult fruitless aSP-g3 (female) neuron; JRC2018Unisex; is part of; female organism; CC-BY-SA_4.0; transmission electron microscopy (TEM)]

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aSP-g3_R#2 (FAFB:1168923) [VFB_00102dvl]

aSP-g3_R#2 [VFB CATMAID Adult Brain (FAFB); aSP-g3_R#2 (FAFB:1168923); adult brain; EM FAFB Taisz and Galili et al., 2022; adult fruitless aSP-g3 (female) neuron; JRC2018Unisex; is part of; female organism; CC-BY-SA_4.0; transmission electron microscopy (TEM)]

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coeloconic sensillum of antennal segment 3 [FBbt_00004177]

Olfactory coeloconic sensillum that is part of antennal segment 3 (Shanbhag et al., 1999). It has a double cuticular wall surrounding a central lumen that houses olfactory receptor neuron dendrites (Shanbhag et al., 1999). Its base is smooth, but distally it its is composed of cuticular fingers, between which run longitudinal grooves (Shanbhag et al., 1999). In the distal part of the sensillum, the central lumen is connected to the longitudinal grooves by radial spoke channels (Shanbhag et al., 1999).

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DA4m_adPN [FBbt_00047714]

Unilateral, uniglomerular antennal lobe (AL) projection neuron whose dendrites mainly innervate glomerulus DA4m (Tanaka et al., 2012). It develops from the ALad1 neuroblast (Bates et al., 2020) and has its soma in the ventral part of the cell body rind around the AL (Tanaka et al., 2012). It bifurcates in the AL hub, with one branch forming glomerular arborizations in DA4m, with some additional neurites around the glomerulus, and one branch joining the medial antennal lobe tract (Tanaka et al., 2012). Collateral branches innervate the central area of the mushroom body calyx and the ventral area of the lateral horn (Tanaka et al., 2012). One of the lateral horn branches turns ventrally and projects via the lateral section of the posterior lateral fascicle to reach the anterior posterior lateral protocerebrum (Tanaka et al., 2012). There is one of these per hemisphere and it is cholinergic (Bates et al., 2020).

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DC3_adPN [FBbt_00040000]

Adult uniglomerular antennal lobe projection neuron from the ad neuroblast (ALad1) lineage whose dendrites mainly innervate antennal lobe glomerulus DC3. This is the sixth cell type to be generated post-embryonically by neuroblast ALad1 (Yu et al., 2010). The axons of these neurons innervate a small area at the anterior edge of the lateral horn, in a similar region to VL2a and VA1lm PNs. There are around three of these per hemisphere, they fasciculate with the medial antennal lobe tract and they are cholinergic (Bates et al., 2020).

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DC4_vPN [FBbt_00049771]

Adult uniglomerular antennal lobe projection neuron from the ALv1 (BAla1) lineage with dendrites that mainly innervate antennal lobe glomerulus DC4 (Bates et al., 2020). There are two of these per hemisphere, they fasciculate with the mediolateral antennal lobe tract and they are GABAergic (Bates et al., 2020). It is a mediolateral antennal lobe tract projection neuron 2 (Bates et al., 2020).

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DL2d_vPN [FBbt_00049768]

Adult uniglomerular antennal lobe projection neuron from the ALv1 (BAla1) lineage with dendrites that mainly innervate antennal lobe glomerulus DL2d (Bates et al., 2020). There are two of these per hemisphere, they fasciculate with the mediolateral antennal lobe tract and they are GABAergic (Bates et al., 2020). It is a mediolateral antennal lobe tract projection neuron 2 (Bates et al., 2020).

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DM4_vPN [FBbt_00049767]

Adult uniglomerular antennal lobe projection neuron from the ALv1 (BAla1) lineage with dendrites that mainly innervate antennal lobe glomerulus DM4 (Bates et al., 2020). There are two of these per hemisphere, they fasciculate with the mediolateral antennal lobe tract and they are GABAergic (Bates et al., 2020). It is a mediolateral antennal lobe tract projection neuron 2 (Bates et al., 2020).

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dorsal organ [FBbt_00002655]

An external compound sense organ of the antenno-maxillary complex of the larval head consisting of two sensilla, a dome shaped cuticular process, and a region surrounding the base of the dome (Campos-Ortega and Hartenstein, 1997; Komarov and Sprecher, 2022). Each dome sensillum is innervated by seven circularly arranged triplets of olfactory receptor neuron dendrites (Komarov and Sprecher, 2022). Eleven sensory neurons of other modalities innervate six sensilla of each base region (Komarov and Sprecher, 2022; Richter et al., 2024).

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large basiconic sensillum of antennal segment 3 [FBbt_00004175]

Large, olfactory basiconic sensillum of antennal segment 3, measuring around 12 micrometers in length and 2.5 micrometers in width, with a blunt tip (Shanbhag et al., 1999). Directly above the base of the sensillum, the shaft diameter is often somewhat reduced resulting in a club-shaped appearance (Shanbhag et al., 1999). The external sensory structure is perforated by pores, arranged along a complicated pattern of branched lines, that connect to a lymph-filled lumen containing the highly branched dendrites of 2-4 ORNs (Shanbhag et al., 1999).

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larval antennal lobe projection neuron [FBbt_00007225]

An antennal lobe projection neuron that is part of the embryonic/larval brain. These neurons innervate the larval antennal lobe and send an axon to higher brain centers, typically including the larval antennal lobe. The soma of these neurons are located in a single, anterodorsal cluster lateral. Since all inputs to the larval antennal lobe are olfactory (Masuda-Nakagawa et al., 2008), these are olfactory projection neurons.

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larval mushroom body output neuron a1 [FBbt_00047965]

Larval odd neuron with its soma just posterior to the mushroom body (Mohamed et al., 2023). It receives input in the ipsilateral calyx, predominantly from Kenyon cells (Saumweber et al., 2018; Mohamed et al., 2023), and has presynaptic terminals in the regions surrounding the ipsilateral and contralateral medial lobes (Mohamed et al., 2023). It is synapsed to MBIN-e1 and FAN-8 (Eschbach et al., 2020). It is involved in odor-based learning (Mohamed et al., 2023) and its activity inhibits turning behavior (Eschbach et al., 2021). It develops from neuroblast CP3 (DL2) and becomes adult MBON29 during metamorphosis (Saumweber et al., 2018; Truman et al., 2023).

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larval mushroom body output neuron a2 [FBbt_00047966]

Larval odd neuron with its soma just posterior to the mushroom body (Mohamed et al., 2023). It receives input in the ipsilateral calyx, predominantly from Kenyon cells (Saumweber et al., 2018; Mohamed et al., 2023), and has presynaptic terminals in the regions surrounding the ipsilateral and contralateral medial lobes (Mohamed et al., 2023). It is involved in odor-based learning (Mohamed et al., 2023) and its activity promotes turning behavior (Eschbach et al., 2021). It develops from neuroblast CP3 (DL2) and becomes adult MBON22 during metamorphosis (Saumweber et al., 2018; Truman et al., 2023).

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lateral antennal lobe tract projection neuron 4 (male) [FBbt_00052112]

Lateral antennal lobe tract projection neuron (lPN4) of the male. It has a greater number of branches in the protocerebrum than the lPN4 cell in the female and additionally innervates the DA1 glomerulus (Tanaka et al., 2021). It is activated following cis-vaccenyl acetate (cVA) exposure and inhibited following application of female cuticular pheromones to the forelegs (Tanaka et al., 2021). It suppresses wing extension during courtship until after tapping behavior has occurred (Tanaka et al., 2021).

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M_l2PN3t18 [FBbt_00049759]

Adult unilateral, multiglomerular antennal lobe projection neuron from the ALl1 (BAlc) ventral hemilineage with dendrites that mainly innervate antennal lobe glomerulus VM6 (Bates et al., 2020; Marin et al., 2020). It receives primarily olfactory input (Marin et al., 2020). There are approximately two of these cells per hemisphere and they fasciculate with the transverse antennal lobe t3ALT tract to innervate the posterior lateral protocerebrum and the wedge (Frank et al., 2015; Bates et al., 2020; Marin et al., 2020). It responds slowly to hot and cold stimuli (Frank et al., 2015).

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M_l2PNl23 [FBbt_00049755]

Adult unilateral, multiglomerular antennal lobe projection neuron from the ALl1 (BAlc) ventral hemilineage with dendrites that innervate antennal lobe glomerulus VP1m (Bates et al., 2020; Marin et al., 2020). It receives mainly olfactory input (Marin et al., 2020). There is one of these per hemisphere and it fasciculates with the lateral antennal lobe tract (Bates et al., 2020; Marin et al., 2020). It projects to the lateral horn and superior lateral protocerebrum (Marin et al., 2020).

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M_lPNm11B [FBbt_00049754]

Adult unilateral, panglomerular antennal lobe projection neuron from the dorsal hemilineage of the lateral neuroblast (ALl1) with substantial dendritic innervation of antennal lobe glomerulus VP1l (Bates et al., 2020; Marin et al., 2020). It receives primarily olfactory input (Marin et al., 2020). It fasciculates with the medial antennal lobe tract to innervate the mushroom body calyx, before curving ventrally to innervate the posterior lateral protocerebrum (Marin et al., 2020). There is around one of these per hemisphere and it is cholinergic (Marin et al., 2020; Bates et al., 2020).

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M_lPNm11D [FBbt_00049753]

Adult unilateral, multiglomerular antennal lobe projection neuron from the dorsal hemilineage of the lateral neuroblast (ALl1) whose dendrites innervate antennal lobe glomerulus VP1d (Bates et al., 2020; Marin et al., 2020). It receives primarily olfactory input (Marin et al., 2020). It fasciculates with the medial antennal lobe tract to innervate the mushroom body calyx, in some cases continuing to the lateral horn (Marin et al., 2020). There are around five of these per hemisphere and they are cholinergic (Marin et al., 2020; Bates et al., 2020).

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M_lv2PN9t49 [FBbt_00049746]

Adult unilateral, multiglomerular antennal lobe projection neuron with its soma in a small cluster (lv2), close to the lvPNs (ALlv1 lineage) and dendrites that innervate antennal lobe glomerulus VP2 (Marin et al., 2020; Bates et al., 2020). It fasciculates with the transverse antennal lobe t9ALT tract to innervate the posterior lateral protocerebrum (Marin et al., 2020).

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M_lvPNm38 [FBbt_00049762]

Adult unilateral, multiglomerular antennal lobe projection neuron from the ALlv1 (BAlp4) lineage with dendrites that mainly innervate antennal lobe glomerulus VM6 (Bates et al., 2020; Marin et al., 2020). It receives primarily olfactory input (Marin et al., 2020). It fasciculates with the medial antennal lobe tract to innervate the lateral horn (Marin et al., 2020). There is one of these cells per hemisphere and it is cholinergic (Bates et al., 2020; Marin et al., 2020).

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M_smPN6t2 [FBbt_00049757]

Adult panglomerular antennal lobe projection neuron with its soma superior and medial to the antennal lobe and dendrites that enter both antennal lobes and have substantial innervation in antennal lobe glomerulus VP1m (Marin et al., 2020; Bates et al., 2020). It receives primarily olfactory input (Marin et al., 2020). There is one of these cells per hemisphere and it fasciculates with the contralateral transverse antennal lobe t6ALT tract to innervate the lateral horn and mushroom body calyx (Marin et al., 2020).

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maxillary palp basiconic sensillum [FBbt_00004159]

Olfactory basiconic sensillum of the maxillary palp. The surface of the sensillum is perforated by numerous pores, arranged along a complicated pattern of branched lines, connecting to a lymph space innervated by branched dendrites from two ORNs. These sensilla are located predominantly on the distal half of the dorsal surface and the lateral edge of each maxillary palp.

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Multiglomerular mALT lvPN#L1 (FAFB:4520197) [VFB_00102dvy]

Multiglomerular mALT lvPN#L1, FBbt:00049785 [Multiglomerular mALT lvPN#L1 (FAFB:4520197); VFB CATMAID Adult Brain (FAFB); adult antennal lobe projection neuron DA1 lvPN; adult brain; EM FAFB Taisz and Galili et al., 2022; JRC2018Unisex; is part of; female organism; CC-BY-SA_4.0; transmission electron microscopy (TEM)]

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Multiglomerular mALT lvPN#L2 (FAFB:7710838) [VFB_00102dw8]

Multiglomerular mALT lvPN#L2, FBbt:00049785 [VFB CATMAID Adult Brain (FAFB); adult antennal lobe projection neuron DA1 lvPN; adult brain; Multiglomerular mALT lvPN#L2 (FAFB:7710838); EM FAFB Taisz and Galili et al., 2022; JRC2018Unisex; is part of; female organism; CC-BY-SA_4.0; transmission electron microscopy (TEM)]

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Multiglomerular mALT lvPN#L3 (FAFB:4520615) [VFB_00102dvz]

Multiglomerular mALT lvPN#L3, FBbt:00049785 [VFB CATMAID Adult Brain (FAFB); adult antennal lobe projection neuron DA1 lvPN; adult brain; EM FAFB Taisz and Galili et al., 2022; JRC2018Unisex; is part of; female organism; Multiglomerular mALT lvPN#L3 (FAFB:4520615); CC-BY-SA_4.0; transmission electron microscopy (TEM)]

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MZ_lv2PN [FBbt_00047724]

Adult unilateral multiglomerular antennal lobe (AL) projection neuron, with both glomerular and non-glomerular arborizations within the AL (Tanaka et al., 2012). Its cell body is found on the ventrolateral side of the AL, near the entry point of the antennal nerve, but it is distinct from the lvPNs (Tanaka et al., 2012; Bates et al., 2020). It receives input in the VA1d and VA1v glomeruli and responds to palmitoleic acid (Tanaka et al., 2021). It fasciculates with the lALT and terminates in the dorsomedial part of the posterior ventrolateral protocerebrum, but does not overlap with the optic lobe glomeruli (Tanaka et al., 2012). It also projects to the antennal mechanosensory and motor center and the gnathal ganglion, but not to the lateral horn (Tanaka et al., 2012). There is usually one of these cells per hemisphere (Tanaka et al., 2012; Bates et al., 2020). It is a sexually dimorphic fruitless neuron, with the male cell having a greater number of branches in the protocerebrum and additionally innervating the DA1 glomerulus (Tanaka et al., 2021).

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olfactory receptor neuron of dorsal organ [FBbt_00007190]

Odorant receptor expressing bipolar neuron whose dendrite innervates the central dome sensillum of the larval dorsal organ, whose cell body is part of the dorsal organ ganglion and whose axon is carried by the antennal nerve to innervate a larval antennal lobe glomerulus. There are 21 neurons of this type. They receive input from and send output to local neurons in the antennal lobe (Berck et al., 2016).

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ORN_DL2v [FBbt_00051495]

Olfactory receptor neuron that expresses the Ionotropic receptor (Ir) 75c and the co-receptor Ir8a (Prieto-Godino et al., 2017; Benton et al., 2025). Its dendrite transduces signals from antennal coeloconic sensillum ac3 type II and its axonal terminals are found in glomerulus DL2v (Prieto-Godino et al., 2017), bilaterally (Schlegel et al., 2021). It has a stronger response to propionic acid and a weaker response to butyric acid, compared to Ir75b neurons (Prieto-Godino et al., 2017). It develops from an Nab precursor (Benton et al., 2025). There are approximately 12 of these cells per antenna (Schlegel et al., 2021).

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ORN_VA7m [FBbt_00048139]

Adult olfactory receptor neuron that expresses Or46aB (Benton et al., 2025). It has its sensory dendrite in an antennal ab6 sensillum and responds to methylphenols (Benton et al., 2025). It sends output to antennal lobe glomerulus VA7m, bilaterally (Benton et al., 2025). It develops from an Nab precursor (Benton et al., 2025). There are approximately 8-11 of these cells on each side (Benton et al., 2025).

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ORN_VL1 [FBbt_00047054]

Adult olfactory receptor neuron that expresses the Ionotropic receptor (Ir) 75d and the co-receptors Ir76b and Ir25a (Silbering et al., 2011; Benton et al., 2025). It responds to pyrrolidine (Benton et al., 2025). There are three subclasses, which all innervate only the ipsilateral antennal lobe glomerulus VL1, with dendrites transducing signals from different antennal coeloconic sensilla (Silbering et al., 2011; Kaur et al., 2019). They all develop from an Naa precursor (Benton et al., 2025).

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ORN_VM5d [FBbt_00007389]

Adult olfactory receptor neuron (ORN) that expresses Or85b and Or85c (Benton et al., 2025). It responds to a few fruity odorants (Benton et al., 2025). It innervates antennal lobe glomerulus VM5d, bilaterally (Benton et al., 2025). It develops from an Nab precursor (Benton et al., 2025). Some of these cells have dendrites in antennal basiconic ab3 sensilla and some in ab11 sensilla (Benton et al., 2025). There are approximately 35 of these cells on each side (Benton et al., 2025).

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ORN_VM6 [FBbt_00048140]

Adult olfactory receptor neuron (ORN) that expresses the ammonium transporter Amt, which allows it to respond to ammonia (Vulpe et al., 2021; Task et al., 2022). It also expresses Ir25a and an additional ammonium transporter, Rh50, neither of which are necessary for sensitivity to ammonia (Vulpe et al., 2021). These neurons have their sensory dendrites in the antenna, either in ac1 sensilla or chamber III of the sacculus (Vulpe et al., 2021; Task et al., 2022). Its axon projects to antennal lobe glomerulus VM6 and arborizes in a subcompartment (Vulpe et al., 2021; Task et al., 2022). These are around 40 of these cells on each side and they all arborize bilaterally in the antennal lobes (Benton et al., 2025).

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small basiconic sensillum of antennal segment 3 [FBbt_00004176]

Small olfactory basiconic sensillum of antennal segment 3, measuring around 9 micrometers in length and around 1.7 micrometers in width at the base, with slight tapering towards the tip (Shanbhag et al., 1999). The surface of the sensillum is perforated by longitudinal rows of pores, connecting to a lymph space innervated by 2 branched olfactory receptor neuron dendrites (Shanbhag et al., 1999).

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trichoid sensillum of antennal segment 3 [FBbt_00004173]

Olfactory sensillum of antennal segment 3 whose external sensory part is a sharply pointed hair arising from a conspicuous cylindrical base. The walls of the hair are perforated by irregularly distributed pores connecting to a lymph filled lumen containing 1-3 ORN dendrites, unbranched except occasionally near the hair tip.

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VA1d_vPN [FBbt_00049766]

Adult uniglomerular antennal lobe projection neuron from the ALv1 (BAla1) lineage with dendrites that mainly innervate antennal lobe glomerulus VA1d (Bates et al., 2020). There is one of these per hemisphere, it fasciculates with the mediolateral antennal lobe tract and it is GABAergic (Bates et al., 2020). It is a mediolateral antennal lobe tract projection neuron 1 (Bates et al., 2020).

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VA6_adPN [FBbt_00007447]

Adult uniglomerular antennal lobe projection neuron from the ad neuroblast lineage with dendrites that mainly innervate antennal lobe glomerulus VA6. It is born during the eighth division of the neuroblast ALad1 during embryogenesis (Yu et al., 2010). The axons of these neurons innervate a small area at the ventroposterior edge of the lateral horn. There is one of these per hemisphere, it fasciculates with the medial antennal lobe tract and it is cholinergic (Bates et al., 2020).

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VA7l_adPN [FBbt_00007448]

Adult uniglomerular antennal lobe projection neuron from the ad neuroblast lineage with dendrites that mainly innervate antennal lobe glomerulus VA7l. It is born from the 13th division of neuroblast ALad1 during embryogenesis (Yu et al., 2010). There is one of these per hemisphere, it fasciculates with the medial antennal lobe tract and it is cholinergic (Bates et al., 2020).

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VC1_lPN [FBbt_00007476]

Adult uniglomerular antennal lobe projection neuron from the ALl1 dorsal hemilineage with dendrites that mainly innervate antennal lobe glomerulus VC1 (Bates et al., 2020). It connects to the mushroom body and lateral horn via the inner antennocerebral tract (medial antennal lobe tract) (Lin et al., 2012). There is around one of these per hemisphere, it fasciculates with the medial antennal lobe tract and it is cholinergic (Bates et al., 2020).

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VC2_lPN [FBbt_00007449]

Adult uniglomerular antennal lobe projection neuron from the ALl1 dorsal hemilineage with dendrites that mainly innervate antennal lobe glomerulus VC2 (Bates et al., 2020). The axons of these neurons innervate the lateral horn. There is around one of these per hemisphere, it fasciculates with the medial antennal lobe tract and it is cholinergic (Bates et al., 2020).

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VL1_ilPN [FBbt_00049772]

Adult uniglomerular antennal lobe projection neuron with its soma in the lateral subesophageal zone and dendrites that mainly innervate antennal lobe glomerulus VL1 (Tanaka et al., 2012; Bates et al., 2020). It bifurcates below the esophagus and has roughly symmetrical innervation in both hemispheres (Tanaka et al., 2012). It follows the mALT, sending branches to the central part of the mushroom body calyx and the posterior ventral lateral horn (Tanaka et a., 2012; Bates et al., 2020). There is one of these per hemisphere and it is cholinergic (Bates et al., 2020).

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VL2a_vPN [FBbt_00049764]

Adult uniglomerular antennal lobe projection neuron from the ALv1 (BAla1) lineage with dendrites that mainly innervate antennal lobe glomerulus VL2a. There are around three of these in each antennal lobe, they fasciculate with the mediolateral antennal lobe tract and they are GABAergic (Bates et al., 2020). It is a mediolateral antennal lobe tract projection neuron 1 (Bates et al., 2020).

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VL2p_adPN [FBbt_00007450]

Adult uniglomerular antennal lobe projection neuron from the ad neuroblast lineage (embryonic born) with dendrites that mainly innervate antennal lobe glomerulus VL2p. It is born in the third division of neuroblast ALad1 during embryogenesis (Yu et al., 2010). There is around one of these per hemisphere, it fasciculates with the medial antennal lobe tract and it is cholinergic (Bates et al., 2020).

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VL2p_vPN [FBbt_00049765]

Adult uniglomerular antennal lobe projection neuron from the ALv1 (BAla1) lineage with dendrites that mainly innervate antennal lobe glomerulus VL2p (Bates et al., 2020). There is one of these per hemisphere, it fasciculates with the mediolateral antennal lobe tract and it is GABAergic (Bates et al., 2020). It is a mediolateral antennal lobe tract projection neuron 1 (Bates et al., 2020).

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VM1_lPN [FBbt_00007452]

Adult uniglomerular antennal lobe projection neuron from the lateral antennal lobe neuroblast (ALl1) dorsal hemilineage with dendrites that mainly innervate antennal lobe glomerulus VM1 (Bates et al., 2020). The axons of these neurons innervate the lateral horn. There are around two of these per hemisphere, they fasciculate with the medial antennal lobe tract and they are cholinergic (Bates et al., 2020).

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VM2_vPN [FBbt_00049770]

Adult uniglomerular antennal lobe projection neuron from the ALv1 (BAla1) lineage with dendrites that mainly innervate antennal lobe glomerulus VM2 (Bates et al., 2020). There are three of these per hemisphere, they fasciculate with the mediolateral antennal lobe tract and they are GABAergic (Bates et al., 2020). It is a mediolateral antennal lobe tract projection neuron 2 (Bates et al., 2020).

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VM6+_lvPN1 [FBbt_00049761]

Adult uniglomerular antennal lobe projection neuron from the ALlv1 (BAlp4) lineage with dendrites that mainly innervate antennal lobe glomerulus VM6 in both hemispheres (Bates et al., 2020; Marin et al., 2020). It receives primarily olfactory input (Marin et al., 2020). It fasciculates with the ipsilateral medial antennal lobe tract to innervate the lateral horn (Marin et al., 2020). There are approximately two of these cells per hemisphere and they are cholinergic (Bates et al., 2020; Marin et al., 2020).

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VM7v_adPN [FBbt_00007454]

Adult uniglomerular antennal lobe projection neuron from the ad neuroblast lineage with dendrites that mainly innervate antennal lobe glomerulus VM7v (also known as glomerulus 1). This is the eighth cell type to be generated post-embryonically by neuroblast ALad1 (Yu et al., 2010). There are around two of these per hemisphere, they fasciculate with the medial antennal lobe tract and they are cholinergic (Yu et al., 2010; Bates et al., 2020).

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VP1m++_vPN [FBbt_00049758]

Adult unilateral, multiglomerular antennal lobe projection neuron of the ALv1 (BAla1) lineage with dendrites that have substantial innervation in antennal lobe glomerulus VP1m (Marin et al., 2020; Bates et al., 2020). It receives primarily olfactory input (Marin et al., 2020). It fasciculates with the mediolateral antennal lobe tract to innervate the lateral horn (Marin et al., 2020). There is one of these cells per hemisphere and it is GABAergic (Bates et al., 2020; Marin et al., 2020).

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VP2++_lvPN [FBbt_00049756]

Adult multiglomerular antennal lobe projection neuron from the ALlv1 neuroblast lineage with dendrites that mainly innervate antennal lobe glomerulus VP2 (Bates et al., 2020; Marin et al., 2020). It receives mainly olfactory input (Marin et al., 2020). It fasciculates with the medial antennal lobe tract, then curves ventrally to innervate the posterior lateral protocerebrum (Marin et al., 2020). There is one of these per hemisphere and it is cholinergic (Bates et al., 2020; Marin et al., 2020).

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