Publication: Fine structure of the retinal epithelium of the tiger salamander (Ambystoma tigrinum)
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Date
1993
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) of the
tiger salamander (Ambystoma tigrinum) consists of a
single layer of large squarnous-shaped cells. These RPE
cells are but minimally infolded basally (sclerally) but
show numerous apical (vitreal) processes that
interdigitate with the photoreceptor ceiis. A series of
apically-located tight junctions joins the RPE cells to
form part of the blood-occular barrier. Internally the
RPE nucleus is large, vesicular and flattened. Smooth
endoplasmic reticulum predominates in these cells with
only occasional small profiles of rough endoplasmic
reticulum present. Polysomes and basally-located
mitochondria are plentiful. Golgi zones, lipid droplets,
lysosome-like bodies and phagosomes of outer segment
material are also present. Myeloid bodies which may
show ribosomes on their surface are also numerous. The
round to oval melanosomes undergo retinomotor
movements and in the light-adapted state reach almost to
the externa1 limiting membrane. Bmch's membrane or
complexus basalis shows a pentalarninate stmcture with
the central elastic lamina poorly represented. The
choriocapillaris is a single layer of large anastomosing
capillaries which are but minimally fenestrated.
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