Publication: Retinal pigment epithelial fine structure in the red-backed salamander (Plethodon cinereus)
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Date
1992
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
red-backed salamander (Plethodon cinerus) consists of a
single layer of large squamous shaped cells. The RPE
cells are but minimally infolded basally (sclerally) but
show many large apical (vitreal) processes interdigitating
with the rod outer segments. These epithelial cells are
joined laterally by prominent tight junctions located in
the mid region of the cells. Internally smooth
endoplasmic reticulum is very plentiful while rough
endoplasmic reticulum is not. Polysomes, small dense
mitochondria and small round to oval melanosomes are
plentiful. Golgi zones and lysosome-like bodies are also
present as are phagosomes of outer segment material and
myeloid bodies. The RPE cell nucleus is large and
vesicular. It is felt that the melanosomes undergo
retinomotor movements but as only light-adapted
specimens were examined it is not known how extensive
are these movements. Bruch's membrane or complexus
basalis shows the typical pentalaminate structure noted
for most vertebrates. The choriocapillaris is a single
layer of large anastomosing capillaries which are
minimally fenestrated facing Bruch's membrane.
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