Publication: Fine structure of the retinal pigment epithelium of the great horned owl (Bubo virginianus)
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Date
1993
Authors
Braekevelt, Charlie R. ; Thorlakson, I.J.
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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 fine structure of the retinal epithelium
(RPE), choriocapillaries and Bruch's membrane
(complexus basalis) has been studied by light and
electron microscopy in the great horned owl (Bubo
virginianus). The RPE consists of a single layer of
cuboidal cells joined laterally in the mid to basa1 region
by a series of tight junctions forming part of the bloodocular
barrier. Basally (sclerally) the epithelial cells
show numerous deep infoldings while apically (vitreally)
a wealth of microvillar processes interdigitate with the
photoreceptor cells. Internally the RPE cells display a
large vesicular nucleus, plentiful smooth endoplasmic
reticulum (SER) and polysomes with only small
scattered profiles of rough endoplasmic reticulum
(RER). Numerous pleomorphic mitochondria are basally
located. In the light-adapted state the melanosomes are
located almost exclusively within the apical processes
indicating retinomotor movements. Myeloid bodies are
numerous and often show ribosomes on their outer
surface. Bruch's membrane is typical of avian species in
that it is pentalarninate and the lamina densa is displaced
towards the choriocapillaris. The choriocapillaris itself is
but minimally fenestrated facing Bruch's membrane.
Most fenestrations present show a single layered
diaphragm while others display a double-layered
diaphragm.
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