Fine structure of the iris and associated structures of the skates Raja asterias and R. clavata.
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Animals↗
Biomedical subjects
K P Kuchnow
Publications and source records attributed to K P Kuchnow.
The elasmobranch pupillary response.
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Animals↗
Threshold and action spectrum of the elasmobranch pupillary response.
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Adaptation, Ocular↗
Pigment migration in the tapetum lucidum of the elasmobranch eye: evidence for a nervous mechanism.
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Animals↗
Fine structure of elasmobranch iris muscle and associated nervous structures.
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Animals↗
Tapetal pigment response of elasmobranchs.
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Animals↗
Threshold for the elasmobranch tapetal-pigment response.
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Adaptation, Ocular↗
Reversible, light-screening pigment of elasmobranch eyes: chemical identity with melanin.
There lies directly beneath the tapetum lucidum, in the eyes of many elasmobranch fishes, a layer of darkly pigmented choroid cells which, in bright light, extend individual strands that aggregate to form a dark, compound curtain which shields the reflecting tapetal cells. This process is reversed in dim light or in darkness; the tapetum is exposed and visual sensitivity presumably Increased. The black choroid pigment has been isolated, analyzed, and shown to possess the properties of melanin.
Animals↗