noun, plural re·tin·u·lae [ri-tin-yuh-lee] /rɪˈtɪn yəˌli/. Anatomy.
a group of elongate neural receptor cells forming part of an arthropod compound eye: each retinula cell leads to a nerve fiber passing to the optic ganglion.
Origin of retinula
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
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Retinula -ae: the retina of a single ocellus: the nerve fibres or cells between pigment cells and retina of the compound eye.
Rhabdom: the rod lying in the axis of the retinula, below the crystalline cone of an eye.