receives synaptic input in region sends synaptic output to region receives synaptic input from neuron sends synaptic output to cell lamina lamina monopolar neuron L1 lamina monopolar neuron L2 lamina monopolar neuron L5 optic lobe centrifugal columnar neuron centrifugal neuron C2 FBbt:00003743 FlyBrain_NDB:10079 Pre- versus postsynaptic innervation in the proximal medulla was inferred by scoring of terminal morphology from figures in Fischbach and Dittrich (1989) as assessed by FlyBrain Neuron DB. Connectivity in the medulla was extrapolated from serial EM of 7 columns from a single sample (Takemura et al., 2013). VFB:FBbt_00003743 fly_anatomy.ontology C2 C2 Adult centrifugal neuron with arborizations in the medulla layers M1, M5/M6, M8 and M10 and more restricted arborizations in the lamina (Fischbach and Dittrich, 1989; Kind et al., 2021). In the medulla, it makes reciprocal connections to lamina monopolar neuron L1, and is presynaptic to L2 and L5, as well as medullary intrinsic neuron Mi1 (Takemura et al., 2013). It is GABAergic (Fei et al., 2010). There is usually one of these cells per optic column (Nern et al., 2025). medulla layer M1 medulla layer M5 medulla layer M8 medulla layer M10 medulla intrinsic neuron Mi1 adult GABAergic neuron