has soma location receives synaptic input in region sends synaptic output to region GABA-Chol neuron T neuron T2 neuron T2 VFB:FBbt_00003728 FlyBrain_NDB:10116 FBbt:00003728 T neuron with its soma posteriorly adjacent to the gap between the medulla and lobula plate and a cell body fiber that projects along the proximal surface of the medulla before branching in the second optic chiasm (Fischbach and Dittrich, 1989; Shinomiya et al., 2019). One branch projects into a medulla column, where it forms a bushy, fine, arborization in medulla layer M9 and then projects through the rest of the medulla column, forming fine arborizations in M1, M2 and M5. The other branch forms a terminal arborization in lobula layer 3 that is much wider than a single column and has bleb-type terminal branches. It seems to be capable of cholinergic and GABAergic neurotransmission. fly_anatomy.ontology T2 The acetylcholine neurotransmitter was assessed by co-labelling cells with a Cha-GAL4.7.4 driver (FBtp0014830) and an anti-ChAT antibody (Varija Raghu et al., 2011). The GABA neurotransmitter was assessed by the intersection of the expression of the VGAT-GAL4 driver (FBtp0069181) and an antibody against GABA (Raghu et al., 2013). Pre- versus postsynaptic innervation judged by scoring of terminal morphology from figures in Fischbach and Dittrich (1989) as assessed by FlyBrain Neuron DB. T neuron T2 medulla layer M1 medulla layer M2 medulla layer M5 medulla layer M9 lobula layer 2 cell body rind of adult posterior lobula plate adult cholinergic neuron adult GABAergic neuron