Publication: Retinal photoreceptor fine structure in the Australian Galah (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 retinal photoreceptors of the galah
(Eolophus r-oseicapilhls), an Australian cockatoo, consist
of rods, single cones and double (unequal) cones present
in a ratio of about 1:3:3 respectively. The rods are long
slim cells which are believed to undergo retinomotor
movements. The rod inner segment displays an ellipsoid
of mitochondria, much rough endoplasmic reticulum
(RER), numerous polysomes and some autophagic
vacuoles. No hyperboloid of glycogen was noted. Single
cones show a slightly tapered outer segment, no oil
droplet but a prominent ellipsoid at the apex and
glycogen scattered throughout the inner segment.
Double cones consist of a chief member which displays
a heterogeneous oil droplet but no paraboloid of
glycogen and an accessory cone with no oil droplet but a
prominent paraboloid. All cones show below the
ellipsoid plentiful polysomes, RER, Golgi zones and
autophagic vacuoles. Cones are not felt to undergo
retinomotor movements. In the light-adapted state the
pigment-laden apical processes of the retinal epithelium
(RPE) cells surround al1 photoreceptor types down to the
inner segments. Along the length of the contiguous
membranes between the two members of the double
cone are membrane densifications that are presumed to
be junctions. All cone photoreceptors are relatively small
in diameter and hence closely packed. Rods and cones
(both types) display both invaginated (ribbon) and
superficial (conventional) synaptic sites.
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