Publication: Fine structure of the retinal pigment epithelium of the mallard duck (Anas platyrhynchos)
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
As part of a comparative morphological
study, the fine structure of the retinal pigment
epithelium (RPE), the choriocapillaris and Bruch's
membrane (complexus basalis) has been investigated by
light and electron microscopy in the mallard (Anas
platyrhynchos). In this species the RPE consists of a
single layer of cuboidal cells which display numerous
very deep basa1 (scleral) infoldings and extensive apical
(vitreal) processes which enclose photoreceptor outer
segments. The RPE cells are joined laterally by
prominent basally-located tight junctions. Internally
smooth endoplasmic reticulum is the most abundant cell
organelle with only small amounts of rough endoplasmic
reticulum present. Polysomes are abundant as are
basally-located mitochondria which often displayed a
ring-shaped profile. The cell nucleus is large and
vesicular. Melanosomes are plentiful only within the
apical processes of the RPE cells in the light-adapted
state. Myeloid bodies are large and numerous and very
often have ribosomes on their outer surface. Bruch's
membrane (complexus basalis) shows a pentalaminate
structure but with only a poorly represented central
elastic lamina. Profiles of the choriocapillaris are
relatively small and the endothelium of these capillaries
while extremely thin facing the retinal epithelium is but
minimally fenestrated.
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