Pm2 [FBbt_00003835]

Pm2

ID: FBbt_00003835

Proximal medullary wide-field amacrine neuron that projects along M7 and branches extensively at the M7/M8 boundary with each branch projecting into medulla layer M9 where it forms an arbor with mixed bleb-type and fine terminals (Morante and Desplan, 2008; Fischbach and Dittrich, 1989).

Neurotransmitter determined to be glutamate based on vGlut[CNSIII]-GAL4 driver (FBti0129148) expression (Raghu and Borst, 2011 - FBrf0213690), but scRNAseq data assigns as GABA based on Gad1 transcripts and lineage (Konstantinides et al., 2022 - FBrf0253187). Nern et al. (2025) - FBrf0262545 identify two subtypes (Pm2a and Pm2b) in the EM data, but do not distinguish these at light level.