Identification of the Cardio-Regulator Nerves in a Marine Hermit Crab and the Shadow-Induced Cardiac Inhibition in Some Decapods(Physiology)

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概要

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• The routes of the cardio-regulator axons from the thoracic ganglion to the heart were identified anatomically and electrophysiologically in a marine hermit crab, Aniculus aniculus. Two pairs of cardio-accelerator axons and one pair of cardio-inhibitor axons were found. On each side, two accelerator axons and one inhibitor axon emerge from the thoracic ganglion in different nerve bundles and join together to form the dorsal cardiac nerve entering the heart. Both cardioaccelerator and inhibitor nerves were found to be tonically active. One of the two accelerator nerves was quite active but the other was much less active. Cardiac inhibition resulted from activation of the inhibitor axon and depression of the accelerator axons. Cardiac inhibition was induced by mechanical stimulation applied to various sites on the body and also by shadow stimulation. Although an increase of neural activity was observed in various peripheral nerves (afferent and efferent, or somatic and visceral nerves), the cardiac inhibition seen in the shadow reflex seems to be primarily a reflex response, mediated by a neural pathway from the compound eyes to the cardio-inhibitor nerve. While all decapods used in the present study showed cardiac inhibition induced by external mechanical stimuli, there seems to have been a tendency for marine (littoral) decapods to respond to shadow stimulation by cardiac inhibition, which is not readily seen for terrestrial decapods in response to the same stimulation.

• 社団法人日本動物学会の論文
• 1985-02-15

著者

• KUWASAWA KIYOAKI

  Department of Bioil08y, Tokyo Metropolitan University

• Kuwasawa K

  Tokyo Metropolitan Univ. Tokyo Jpn

• Miyazaki Takefumi

  Department Of Biology Tokyo Metropolitan University:(present Addresses)department Of Physiology Toky

• Mashimo Keiko

  Department Of Biology Tokyo Metropolitan University:(present Addresses)department Of Legal Medicine

• YAZAWA TOHRU

  Department of Biology, Tokyo Metropolitan University

• Yazawa Tohru

  Department Of Biology Tokyo Metropolitan University

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