retinulan.
/rᵻˈtɪnjᵿlə/, U.S. /rəˈtɪnjələ/ Zoology.
In the eyes of various invertebrates: a group of elongated neuronal cells forming the light-sensitive unit of the retina (or of each ommatidium in a compound eye). Frequently attributive, esp. in retinula cell. Cf. rhabdomere n.
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the world > animals > invertebrates > phylum Arthropoda > [noun] > member of > parts of > eye > cell from which rhabdom arises
retinula1878
retinule1890
1878 F. J. Bell & E. R. Lankester tr. C. Gegenbaur Elements Compar. Anat. 264 The retinal cells which give rise to the rhabdom constitute a retinula.
1888 G. Rolleston & W. H. Jackson Forms Animal Life (ed. 2) 168 A basement membrane..separates the retinulae from the optic ganglion.
1947 A. D. Imms Outl. Entomol. (ed. 3) ii. 37 A retinula is composed of a group of visual cells surrounding a longitudinal optic rod or rhabdom.
1978 Nature 29 June 772/1 The Drosophila compound eye consists of about 700 ommatidia, each containing six peripheral and two central retinula cells (photoreceptors).
2003 P. M. Whitington in G. Scholtz Evolutionary Developmental Biol. Crustacea ii. 160 Bundles of fibers, each of which may represent the retinula axons from a single proto-ommatidium are evident.
This entry has been updated (OED Third Edition, March 2010; most recently modified version published online March 2022).
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n.1878