Fine structure of the retinal epithelium (RPE) of the emu (Dromaius novaehollandiae).

Abstract:

:As part of an ongoing comparative fine structural study, the retinal pigment epithelium (RPE), choriocapillaris and complexus basalis (Bruch's membrane) in the emu (Dromaius novaehollandiae) have been investigated by light and electron microscopy. The RPE consists of a single layer of cuboidal cells joined basally by a series of tight junctions. Basally (sclerally) the RPE cells display numerous deep infoldings while apically (vitreally) plentiful microvillar processes interdigitate with the photoreceptor outer segments. Internally the epithelial cells show a large vesicular nucleus, plentiful smooth endoplasmic reticulum (SER) and numerous polysomes, but very little rough endoplasmic reticulum (RER). Numerous pleomorphic mitochondria are predominantly basally located. In the light-adapted specimens studied, the melanosomes of the RPE are almost exclusively located within the apical processes of these cells. Phagosomes and lysosome-like bodies are also present, as are myeloid bodies which often display ribosomes on their outer surface. Bruch's membrane (complexus basalis) is typical of avian species in that it is pentalaminate and the central lamina densa is displaced towards the choriocapillaris. The choricocapillaris endothelium is attenuated but only minimally fenestrated facing Bruch's membrane. Most of these fenestrations show a single-layered diaphragm but fenestrations with a double-layered diaphragm are not uncommon.

journal_name

Tissue Cell

journal_title

Tissue & cell

authors

Braekevelt CR

doi

10.1016/s0040-8166(98)80063-3

subject

Has Abstract

pub_date

1998-04-01 00:00:00

pages

149-56

issue

2

eissn

0040-8166

issn

1532-3072

pii

S0040-8166(98)80063-3

journal_volume

30

pub_type

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