Y4 [FBbt_00003915]

Y4

ID: FBbt_00003915

Y neuron whose cell body fiber projects through the lobula plate without arborizing. It branches extensively in the second optic chiasm, with one branch doubling back to form a fine terminal arborization in lobula plate layers 1 and 2. Multiple branches arborize in the lobula, reaching most layers, with a mix of terminal morphologies. A branch projects into the medulla where it forms a wide asymmetric terminal arbor that projects mainly along medulla layers M8-M9.

Pre- versus postsynaptic innervation judged by scoring of terminal morphology from figures in Fischbach and Dittrich (1989) as assessed by FlyBrain Neuron DB.