Publication: Fine structure of the pecten oculi in the Austral ian Gala h (Eolophus roseicapillus) (Aves)
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Date
1996
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
The pecten oculi of the Australian galah
(Eolophus r.oseicapillus) has been examined by both
light and electron microscopy. In this species the pecten
is large relative to the size of the eye and is of the
pleated type. It consists of 20-25 accordion folds that are
joined apically by a bridge of tissue which holds the
pecten in a fan-like shape widest at its base. Within each
fold are many melanocytes, numerous capillaries as well
as larger supply and drainage vessels. The capillaries are
extremely specialized for transport functions and display
extensive microfolds on both their luminal (inner) and
abluminal (outer) borders. Except for the nuclear region
which also contains most of the organelles, the
endothelial cell bodies are extremely thin. These
capillaries are surrounded by thick fibrillar basal laminae
which are felt to be structurally important. Pericytes are
a common feature within the basal lamina of capillaries.
The numerous pleomorphic melanocytes which more or
less surround the capillaries are also presumed to be
important in structural support of the pecten. The pecten
represents a supplementary retinal circulation and is
comparable to the falciform process of some teleosts, the
conus papillaris of reptiles, the supraretinal vessels of
amphibians and some teleosts and the intraretinal vessels
of mammals, al1 of which are felt to be alternative
methods of bringing nutrients to the inner retina.
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