PMID: 3746724Jul 1, 1986Paper

Photoreception in pineal organs of larval and adult lampreys, Lampetra japonica

Journal of Comparative Physiology. A, Sensory, Neural, and Behavioral Physiology
S Tamotsu, Y Morita

Abstract

A comparative study of the larval and adult pineal organs, which are sensitive to incident light, was carried out in the river lamprey Lampetra japonica, using intracellular recording from the pineal photoreceptors. The tissue overlying the larval pineal organ is transparent, whereas that over the adult pineal is translucent. The optical density of this oval pineal window in the adult lamprey was 1.2. In order to elucidate the early development of the larval pineal, the ratio r of the diameter (micron) of the pineal to the body-length (cm) was measured. The value of r was 62.5 in a small larva of 2.8 cm, 29.7 in a larger one of 14.3 cm, and 9.3 in an adult of 54 cm body-length. The intracellular response to light of the larval pineal was a hyperpolarization, showing fundamentally the same pattern as that of the adult pineal. It was possible to record a typical response even from the pineal of the smallest larva, 2.8 cm in body length, used in this study. The intensity-amplitude relationship was analysed after Naka-Rushton's hyperbolic equation. The value of sigma of isolated larval pineals was 0.88 log unit higher than that of adults. The value of n was larger in larvae, suggesting a sensitive reaction to changing photic stimul...Continue Reading

References

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Citations

Nov 1, 1990·Fish Physiology and Biochemistry·T Nordtug, O K Berg
Apr 1, 1993·Journal of Comparative Physiology. A, Sensory, Neural, and Behavioral Physiology·S E Dryer, D Henderson
Sep 5, 2008·Journal of Comparative Physiology. A, Neuroethology, Sensory, Neural, and Behavioral Physiology·Thomas R Binder, D Gordon McDonald
Nov 20, 2002·Proceedings of the National Academy of Sciences of the United States of America·Yoichi AsaokaYoshitaka Fukada
Oct 30, 2009·Cellular and Molecular Life Sciences : CMLS·Helena J Bailes, Robert J Lucas
Jan 5, 2002·The Journal of Comparative Neurology·Miguel Meléndez-FerroRamón Anadón
Jun 25, 2009·Journal of Neurochemistry·Gladys Y-P KoMichael L Ko
Jun 28, 2002·Physiological Reviews·U Benjamin Kaupp, Reinhard Seifert
Sep 18, 2007·Molecular Endocrinology·Shin-Ichi NishioVincent Laudet
Sep 4, 2021·Integrative and Comparative Biology·Skye D FissetteWeiming Li

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