Publication: Fine structure of the retinal photoreceptors of the barred owl (Strix varia)
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Date
1996
Authors
Braekevelt, Charlie R. ; Smith, S.A. ; Smith, B.J.
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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 photoreceptors of the barred owl (Strix
varia) consist of rods, single cones and unequal double
cones present in a ratio of about 35:1:3. In the lightadapted
condition the rods are of uniform diameter along
their entire length and are therefore not felt to undergo
photomechanical changes. The rod outer segment
consists of a stack of scalloped bimembranous discs
enclosed in a limiting membrane. The rod inner segment
displays an ellipsoid of mitochondria, much rough
endoplasmic reticulum (RER), numerous polysomes,
Golgi zones and autophagic vacuoles, but no
hyperboloid of glycogen. Single cones show a slightly
tapered outer segment and a heterogeneous oil droplet
along with an ellipsoid of mitochondria at the apex of
the inner segment. Double cones consist of a larger chief
member which also displays a heterogeneous oil droplet
and a slightly smaller accesory member which does not.
Both members of the double cone as well as the single
cones show plentiful polysomes and RER as well as
Golgi zones in the inner segment, but none of the cones
possessed a condensed paraboloid of glycogen. The
contiguous membranes of the chief and accessory cones
displayed a few presumed junctional complexes. Judging
by their elongated shape in the light-adapted state, cones
in this species do not undergo retinomotor movements.
Rods and both types of cones have both invaginated
(ribbon) and superficial (conventional) synaptic sites.
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Citation
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