R8 [FBbt_00004227]

Inner photoreceptor cell of the ommatidium whose rhabdomere is located proximally, directly below that of R7 (Wernet and Desplan, 2004). It has a single axon that extends through a single column of the lamina without making synapses and crosses the first optic chiasm to reach the medulla (Fischbach and Dittrich, 1989). It forms reciprocal inhibitory histaminergic synapses with the R8 photoreceptor of the same optic column (Schnaitmann et al., 2018), with a large proportion in the first optic chiasm (Kind et al., 2021). It is also cholinergic (Davis et al., 2020).
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R8 R8 R8 R8

R8

ID: FBbt_00004227

Adult Cholinergic Histaminergic Nervous system Sensory neuron Visual system

Inner photoreceptor cell of the ommatidium whose rhabdomere is located proximally, directly below that of R7 (Wernet and Desplan, 2004). It has a single axon that extends through a single column of the lamina without making synapses and crosses the first optic chiasm to reach the medulla (Fischbach and Dittrich, 1989). It forms reciprocal inhibitory histaminergic synapses with the R8 photoreceptor of the same optic column (Schnaitmann et al., 2018), with a large proportion in the first optic chiasm (Kind et al., 2021). It is also 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.

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## Classification

Relationships

Alternative Names

Synonym Scope Reference
lamina receptor cell R8 exact synonym
receptor cell R8 related synonym
R8 exact synonym Schlegel et al., 2024
R8 exact synonym Özel et al., 2021