FB2026_03 , released September 17, 2026
CV Term Report
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Term transmedullary neuron Tm5a ID (Ontology) FBbt:00110072 (Fly Anatomy)
Definition Transmedullary Tm5 neuron that is centered on a single yellow column in the medulla and arborizes in the M3, M6 and M8 layers, reaching some neighboring columns laterally (Kind et al., 2021). It selectively receives input from the R7 (and not R8) photoreceptor of its central column (Kind et al., 2021). Its axon terminates in lobula layer 5B after a characteristic reversal of direction (Kind et al., 2021). It provides input to the lobula intrinsic neuron Li4 via many synapses, and also to the lobula tangential neuron LT11 (Lin et al., 2016). It is a cholinergic neuron (Karuppudurai et al., 2014).[ FlyBase:FBrf0049410 FlyBase:FBrf0206213 FlyBase:FBrf0224070 FlyBase:FBrf0230403 FlyBase:FBrf0252485 ]
Also Known As"Tm5a"
CommentConnectivity in the medulla inferred from EM reconstructions (Gao et al., 2008; Kind et al., 2021). The neurotransmitter was assessed by immunohistochemistry (Karuppudurai et al., 2014). Connectivity in the lobula was assessed by GRASP and double-labeling EM (Lin et al., 2016).
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VFB:FBbt_00110072
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transmedullary neuron
 |__transmedullary neuron Tm5____________
 |__narrow field transmedullary neuron___|
cholinergic neuron                       |
 |__adult cholinergic neuron_____________|
adult neuron                             |
 |__adult cholinergic neuron_____________|
optic lobe narrow field columnar neuron  |
 |__narrow field transmedullary neuron___|
                                         transmedullary neuron Tm5a  14 rec.
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VFB:FBbt_00110072