Publication: Retinal photoreceptor fine structure in the short-tailed stingray. Dasyatis brevicaudata
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Date
1994
Authors
Braekevelt, Charlie R.
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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 fine structure of the retinal photoreceptors
has been studied by light and electron
microscopy in the short-tailed stingray (Dasyatis
brevicaudata). The duplex retina of this elasmobranch
contains rods and cones in a ratio of about 10:l. No
multiple receptors were noted nor was a repeating or
mosaic arrangenient of the cones obvious. Only lightadapted
specimens were studied but retinomotor
movements of the photoreceptors were felt to be
minimal or absent. The rods are large cylindrical cells
with inner and outer segments of much the same
diameter. Cones are short stout cells with a conical outer
segment and a wider inner segment. Rod outer segment
discs show peripheral incisures while cones do not. The
inner segment of rods and cones are rich in organelles
indicating much synthetic activity. The nuclei of rods
and cones appear quite similar but cone nuclei are
invariably at least partially protruded through the
external limiting membrane which is formed by a series
of zonulae adherentes between photoreceptor cells and
Miiller cells. The synaptic region of both rods and cones
display both invaginated (ribbon) synapses and
superficial (conventional) synapses.
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