Publication: Fine structure of the conus papillaris in the bobtail
goanna (Tiliqua rugosa)
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Date
1989
Authors
Braekevelt, Charlie R.
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DOI
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info:eu-repo/semantics/article
Description
Abstract
The structure of the conus papillaris in an
Australian lizard. the bobtail goanna (Tiliqua rugosa)
was investigated by lipht and electron microscopy. In this
strongly diurrial species, the conus papillaris consists of a
heavily vascularized and pigmented, finger-like structure
about 1 mm ir1 diameter and 3-3 mm in length. It is
situated over the optic nerve head and projects into the
vitreous chamber. Within the conus are numerous
capillaries and larger blood vessels. melanocytes and
occasional mast cells. Many of the capillaries display
prominent luminal and abluminal microfolds. Other
capillaries show no microfolds while still others display
an intermediate number of microfolds. The larger blood
vessels are usually indistinguishable as to being either
arterioles or venules. The endothelial cells of al1 blood
vessels show a population of cytoplasmic granules. The
melanocytes are large pleomorphic cells usually rich in
microfilaments. Unmyelinated nerve processes are
plentiful within the conus and the Schwann cells
ericlosing these nerve fibres are occasionally seen to be
pigmented. The rnorphology of the conus papillaris
indicates a heavy involvernent in the transport of
materials. It is considered to be homologous to the
pecten oculi of the avian eye: to the falciform process of
the teleost eye; to the supraretinal vessels of amphibians
and to the intraretinal vessels of the mammalian eye.
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