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Photoentrainment of the circadian rhythm in the electroretinogram of the crayfish and its dependence on the sinus gland

✍ Scribed by Moreno-Sáenz, Enrique ;Fuentes-Pardo, Beatriz ;Hernández-Falcón, Jesús

Publisher
John Wiley and Sons
Year
1992
Tongue
English
Weight
848 KB
Volume
264
Category
Article
ISSN
0022-104X

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✦ Synopsis

Abstract

Sinus gland participation on the phase relationship between the circadian rhythms of the response to light (electroretinogram, ERG) of the visual photoreceptors in the crayfish was studied. Chronic ERG recordings were simultaneously obtained from both eyestalks in intact and sinus‐gland‐deprived animals during free‐running conditions and during the application of external periodic signals that consisted of 12 hr of light and 12 hr of darkness, or 12 hr of darkness and 12 hr of light, light regimens. It was found that the sinus glands are indispensable for preservation of the main characteristics of the circadian rhythm in the ERG and for the maintenance of a tight phase relationship between the rhythms of both eyes under free‐running conditions and during the application of the 2 kinds of light regimen. It is concluded that the sinus glands play a determining role in the processes that confer an internal temporal order on crayfish. © 1992 Wiley‐Liss, Inc.

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