retinula

[ri-tin-yuh-luh]

noun

Anatomy.

plural

retinulae 

1. 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.

Other Word Forms

• retinular adjective

Word History and Origins

Origin of retinula¹

From New Latin, dating back to 1875–80; retina, -ule

Example Sentences

Those nearest to the lens are the corneagen cells of this more elaborated eye, and those between the original retinula cells and the corneagen cells become firm and transparent.

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B represents an intermediate hypothetical form in which the cells beneath the lens are beginning to be superimposed as corneagen, vitrella and retinula, instead of standing side by side in horizontal series.

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C, Transverse section of the rhabdom of a retinula of the scorpion’s central eye, showing its five constituent rhabdomeres as rays of a star.

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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.

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Rhabdom: the rod lying in the axis of the retinula, below the crystalline cone of an eye.

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