part of has soma location develops from has synaptic IO in region photoreceptor cell adult optic lobe retina ommatidium sensory organ cell eye photoreceptor cell lamina receptor cell FBbt:00006009 Photoreceptor cell that forms the core of each ommatidium in the adult eye. Eight of these photoreceptors are arranged in each ommatidial core, bundled like the staves of a barrel. Each has a photosensitive rhabdomere that projects into the barrel cavity and adjacent supporting membrane, the stalk (Wolff and Ready, 1993). Each extends an axon into the optic lobe. Activation of the photoreceptor by light results in depolarization and in histamine release at the synapses of these axons (Sarthy, 1991). CL:2000019 VFB:FBbt_00006009 fly_anatomy.ontology FBbt:00003709 Note - eyelet photoreceptors are NOT sub-types. retinula cell rhabdomeric photoreceptor cell eye photoreceptor precursor cell adult histaminergic neuron adult sensory neuron adult PNS neuron