Tm3 [FBbt_00003791]

Tm3

ID: FBbt_00003791

Transmedullary narrow field neuron that terminates in lobula layers 1 and 4 with bleb-like terminal arborizations. It has fine arborizations in medulla layers M1, M4, and M5, and has bleb-type arborization in medulla layers M1, M4, M9 and M10 (Morante and Desplan, 2008; Fischbach and Dittrich, 1989). Pre-synaptic terminals are present mainly in medulla layers M9-M10, but also in all other layers where neurites extend laterally (Pankova and Borst, 2017). It receives input from lamina monopolar neuron L1 and L5 and medullary intrinsic neuron Mi1 and it outputs to T4 neurons (Takemura et al., 2013). It seems to be capable of both cholinergic (Pankova & Borst, 2017) and GABAergic (Raghu et al., 2013) neurotransmission.

Pre- versus postsynaptic innervation judged by scoring of terminal morphology from figures in Fischbach and Dittrich (1989) as assessed by FlyBrain Neuron DB. The neurotransmitter was assessed to be GABA by the intersection of the expression of the VGAT-GAL4 driver (FBtp0069181) and an antibody against GABA (Raghu et al., 2013). Connectivity in the medulla was assessed by electron microscopy reconstruction from 7 columns (Takemura et al., 2013). Neuron was assessed to be cholinergic based on anti-HA antibody detection of HA-tagged VAChT expression (Pankova & Borst, 2017).