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Fine structure of the retinal epithelium and tapetum lucidum in the giant danio (Danio malabaricus) (Teleost)

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Summary

The normal morphology of the retinal epithelium and tapetum lucidum has been studied by transmission electron microscopy in the eye of a teleost; the giant danio (Danio malabaricus). The retinal epithelium forms a single layer of cells joined laterally by cell junctions. Centrally in the retina these cells are tall columnar, while more peripherally they become more cuboidal in shape. Apical processes of these cells enclose photoreceptor inner and outer segments. Few basal (scleral) infoldings are seen in the epithelial cells. Throughout the epithelial layer the cells display smooth endoplasmic reticulum, numerous mitochondria and phagosomes. Within the epithelial cells centrally located in the retina are found numerous lipid spheres which act as a tapetum lucidum. Only at the extreme periphery are these reflective spheres scarce or absent from the epithelial cells. Melanosomes, although found throughout the epithelial layer, are scarce centrally and more numerous peripherally. A population of wandering phagocytes appears to be a normal feature within the retinal epithelial layer of this species. Bruch's membrane shows a trilaminate composition rather than the usual pentalaminate structure seen in most vertebrates. The choriocapillaris endothelium facing Bruch's membrane is very thin but only minimally fenestrated.

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  1. Department of Anatomy, The University of Manitoba, Winnipeg, Manitoba, Canada

    Charlie R. Braekevelt

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Braekevelt, C.R. Fine structure of the retinal epithelium and tapetum lucidum in the giant danio (Danio malabaricus) (Teleost). Anat Embryol 158, 317–328 (1980). https://doi.org/10.1007/BF00301820

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