Publication: Retinal pigment epithelial fine structure in the bobtail
goanna (Tiliqua rugosa)
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Date
1989
Authors
Braekevelt, Charlie R.
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Publisher
Murcia : F. Hernández
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DOI
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info:eu-repo/semantics/article
Description
Abstract
The retinal pigment'epithelium (RPE), the
choriocapillaris and Bruch's membrane (complexus
basalis) have been studied by light and electron
microscopy in the bobtail goanna (Tiliqua rugosa) an
Australian diurna1 lizard. The RPE consists of a single
layer of cuboidal cells which display very deep and
tortuous basal (choroidal) infoldings as well as numerous
apical (vitreal) processes which interdigitate with the
photoreceptor cells. The lateral cell borders are
relatively smooth and joined by basally located tight
junctions. Internally smooth endoplasmic reticulum is
abundant while rough endoplasmic reticulum is not. The
RPE cell nucleus is large and vesicular and basally
located in the light-adapted state. Polysomes,
mitochondria and myeloid bodies are present and widely
distributed. Melanosomes are plentiful in the apical
region of the epithelial cells in light-adaptation. Bruch's
membrane is pentalaminate with the basal lamina of
the choriocapillaris being exceptionally thick. The
choriocapillaris is a single layer of large-caliber
capillaries with thin but only moderately fenestrated
endothelium. Numerous dense granules are always
present within these endothelial cells.
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