Publication: Retinal pigment epithelial fine structure in
the Australian Galah (Eolophus roseicapillus) (Aves)
Authors
Braekevelt, Charlie R. ; Richardson, K.C.
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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 epithelium (RPE),
choriocapillaris and Bruch's membrane (complexus
basalis) has been investigated by light and electron
microscopy in the galah (Eolophus I-oseicapillus), an
Australian cockatoo. The RPE consists of a single layer
of low cuboidal cells joined basally by a series of
zonulae occludentes. Basally (sclerally) the retinal
epithelial cells display numerous deep infoldings while
apically (vitreally) microvillar processes interdigitate
with photoreceptor outer segments. Internally the RPE
cells show a large vesicular nucleus, plentiful smooth
endoplasmic reticulum (SER) and numerous polysomes
but very little rough endoplasmic reticulum (RER).
Numerous mitochondria are located basally. In the lightadapted
specimens studied, the melanosomes of the RPE
are almost exclusively located within the apical
processes indicating that retinomotor movement of this
pigment probably occurs. Phagosomes and lysosomelike
bodies are present as are myeloid bodies which may
show ribosomes on their outer surface. The choriocapillaris
endothelium is thin but only minimally fenestrated
facing Bruch's membrane. Most fenestrations of the
choriocapillaris display a single-layered diaphragm
while the remainder have a double-layered diaphragm.
Bruch's membrane (complexus basalis) is typical of
avian species in that it is pentalaminate with the central
lamina densa displaced towards the choriocapillaris.
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