has soma location develops from receives synaptic input in region sends synaptic output to region adult optic lobe neuron medulla layer M8 medulla layer M9 proximal medullary amacrine neuron Notch OFF hemilineage secondary neuron immature proximal medullary amacrine neuron Pm4 adult GABAergic neuron cell body rind of adult medulla proximal medullary amacrine neuron Pm4 2015-11-10T14:48:20Z fly_anatomy.ontology Pm4 VFB:FBbt_00111282 FBbt:00111282 Pm05 Proximal medullary amacrine neuron that branches at the proximal surface of the medulla. It covers around 10-20 columns with its pre- and post-synapses mostly in layers M8-M9 (Nern et al., 2025). It occupies a central intracolumnar position. It is GABAergic (Davis et al., 2020). There are around 75-85 of these neurons per hemisphere (Nern et al., 2025). Pm4