bulb [FBbt_00003682]

A bilaterally paired synaptic neuropil domain located lateral to the ellipsoid body and anterior lateral to the fan-shaped body. It contains 80 microglomeruli characterized by their granular texture. It is formed primarily by the collateral arborizations of neuronal fibers that project to the ellipsoid body and by the terminals of the fibers projecting from the anterior optic tubercle and other neuropils. (Chiang et al., 2011, Lin et al., 2013)

Tags:

bulb

ID: FBbt_00003682

Adult Nervous system Synaptic neuropil domain

The bulb corresponds to the medial part of the mimpr of Otsuna and Ito, (2006) and to the lateral triangle of Chiang et al., 2011 (Ito et al., 2014.

Open in VFB 3D Browser →

Classification

Relationships

develops from: bulb primordium
is part of: lateral complex

Alternative Names

Synonym	Scope	Reference
BU_L	related synonym	Schlegel et al., 2024, Bates et al., 2025
BU(R)	related synonym	Berg et al., 2025, Nern et al., 2025, Scheffer et al., 2020
BU_R	related synonym	Bates et al., 2025, Schlegel et al., 2024, name_in_banc
BU(L)	related synonym	Berg et al., 2025, Scheffer et al., 2020, Nern et al., 2025
isthmus	exact synonym
BU	exact synonym	Ito et al., 2014
Lat Tri	exact synonym	Chiang et al., 2011
lateral triangle	exact synonym
ltr	exact synonym
mimpr	broad synonym	Otsuna and Ito, 2006
IST	related synonym	Ito et al., 2014

Cross References

bulb on Insect Brain DB (23)

Downloads

Image files aligned to BU(L) on JRC_FlyEM_Hemibrain:

Image files aligned to BU(R) on JRC_FlyEM_Hemibrain:

Image files aligned to bulb on adult brain template JFRC2:

Image files aligned to bulb on adult brain template Ito2014:

Image files aligned to BU on JRC2018Unisex adult brain:

List all available images of bulb (5 total)

Thumbnail	Name	Tags
	BU on JRC2018Unisex adult brain	Nervous_system, Adult, Synaptic_neuropil_domain
	BU(L) on JRC_FlyEM_Hemibrain	Nervous_system, Adult, Synaptic_neuropil_domain
	BU(R) on JRC_FlyEM_Hemibrain	Nervous_system, Adult, Synaptic_neuropil_domain
	bulb on adult brain template Ito2014	Nervous_system, Adult, Synaptic_neuropil_domain
	bulb on adult brain template JFRC2	Nervous_system, Adult, Synaptic_neuropil_domain

View all 5 results in VFB →

Neurons with some part in bulb (40 total)

Thumbnail	Name	Tags
	adult bulb-ellipsoid body nubbin neuron	Adult, Nervous_system, Neuron
	adult fan-shaped body-bulb neuron	Adult, Nervous_system, Neuron
	adult lateral fan-shaped body tangential neuron Fl4	Adult, Nervous_system, Neuron
	adult odd neuron of the calyx	Adult, Nervous_system, Neuron
	adult odd neuron of the central brain	Adult, Nervous_system, Neuron

View all 40 results in VFB →

Neurons with synaptic terminals in bulb (38 total)

Thumbnail	Name	Tags
	TUBUi	Adult, lineage_AOTUv4_DALcl2, secondary_neuron
	TUBUs	Adult, lineage_AOTUv3_DALcl1, secondary_neuron
	adult bulb-ellipsoid body nubbin neuron	Adult, Nervous_system, Neuron
	adult fan-shaped body-bulb neuron	Adult, Nervous_system, Neuron
	adult lateral fan-shaped body tangential neuron Fl4	Adult, Nervous_system, Neuron

View all 38 results in VFB →

Neurons with presynaptic terminals in bulb (19 total)

Thumbnail	Name	Tags
	ExR2	Adult, Dopaminergic, lineage_DM6_CM3, primary_neuron
	TUBUi	Adult, lineage_AOTUv4_DALcl2, secondary_neuron
	TUBUs	Adult, lineage_AOTUv3_DALcl1, secondary_neuron
	TuBu02	Adult, lineage_AOTUv4_DALcl2, secondary_neuron
	TuBu03	Adult, lineage_AOTUv4_DALcl2, secondary_neuron

View all 19 results in VFB →

Parts of bulb (3 total)

Thumbnail	Name	Tags
	anterior bulb	Adult, Nervous_system, Synaptic_neuropil_subdomain
	inferior bulb	Adult, Nervous_system, Synaptic_neuropil_subdomain
	superior bulb	Adult, Nervous_system, Synaptic_neuropil_subdomain

View all 3 results in VFB →

Images of neurons with some part in bulb (1810 total)

Thumbnail	Name	Tags
	BANC_626:720575941469381696	Adult, GABAergic, lineage_EBa1_DALv2, secondary_neuron
	BANC_626:720575941670159025	Adult, GABAergic, lineage_EBa1_DALv2, secondary_neuron
	ER3w	Adult, GABAergic, lineage_EBa1_DALv2, secondary_neuron
	TuBu02	Adult, Cholinergic, lineage_AOTUv4_DALcl2, secondary_neuron
	TuBu03	Adult, Cholinergic, lineage_AOTUv4_DALcl2, secondary_neuron

View all 1810 results in VFB →

Transgene expression in bulb (3580 total)

Thumbnail	Name	Tags
	P{GMR10B11-GAL4} expression pattern	Expression_pattern
	P{GMR10B02-GAL4} expression pattern	Expression_pattern
	PBac{681.P.FSVS-1}Spn[CPTI001457] expression pattern	Expression_pattern
	PBac{754.P.FSVS-0}Alat[CPTI003349] expression pattern	Expression_pattern
	PBac{768.FSVS-0}CG43427[CPTI003445] expression pattern	Expression_pattern