has characteristic has soma location fasciculates with capable of sends synaptic output to region Bolwig nerve photoreceptor neuron sensory organ cell Bolwig organ photoreceptor cell of Bolwig organ 2008-11-03T01:09:55Z Photoreceptor cell that is part of a Bolwig's organ. Unlike the photoreceptors of the adult eye, eyelet and ocellus, these photoreceptors do not contain rhabdomeres, but instead have apical surfaces which are folded into numerous horizontal microtubule-containing microvillar-like processes (Green et al., 1993; Hartenstein et al., 2019). These processes are variable in length, diameter and spacing, but align approximately along a ventro-anterior to dorso-posterior axis relative to the body and do not branch (Hartenstein et al., 2019). There are around 12 of these cells per hemisphere and their axons enter the brain ventrolaterally via the Bolwig nerve and terminate in the larval optic neuropil (Larderet et al., 2017). There are two mutually exclusive subtypes, expressing Rh5 or Rh6, both of which are cholinergic and are capable of entraining the molecular clock by light (Keene et al., 2011). larval PRC VFB:FBbt_00007253 photoreceptor cell of Bolwig's organ larval photoreceptor neuron FBbt:00007253 fly_anatomy.ontology larval optic neuropil larval cholinergic neuron embryonic/larval sensory neuron larval PNS neuron entrainment of circadian clock by photoperiod unilateral