photoreceptor cell R8 [FBbt_00004227]
Inner photoreceptor cell of the ommatidium whose rhabdomere is located proximally, directly below that of R7 (Wernet and Desplan, 2004). Each has a single axon that extends through a single lamina optic cartridge without making synapses. It is both histaminergic and cholinergic (Davis et al., 2020). Fischbach and Dittrich (1989) suggest there may be two (non-DRA) variants of R8, one terminating in each of M3 and M4; this has not been substantiated in subsequent papers.
Note
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VFB Term Json
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