Both the Heart and Pericardium in the Chiton Acanthopleura japonica Receive Dual Innervation from the Central Nervous System

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概要

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• The isolated heart or pericardium of the chiton Acanthopleura japonica each showed rhythmic automaticity, even after they were isolated from the body. Intracellular action potentials could be recorded from spontaneously active myocardial cells in the isolated heart and pericardium. They always appeared to be preceded by pacemaker potentials much as has been found for myocardial cells of other molluscs. These show that both heart and pericardial beats of Acanthopleura have a myogenic nature. Stimuli applied to each of the lateral and ventral nerve cords produced both excitatory and inhibitory effects on the heart and the pericardium. Both the heart and the pericardium in Acanthopleura may receive excitatory and inhibitory control from each of the lateral and ventral nerve cords. The dual innervation of the heart which is seen commonly in molluscs, at higher stages of evolution, may have been established in Acanthopleura at the stage of the phylogenetic beginning of the Mollusca. On the contrary, the dual innervation which is required for acceleratory and inhibitory control of the spontaneously rhythmically active pericardium is different from the innervation seen in molluscs at the higher stages.

• 社団法人日本動物学会の論文
• 1996-02-15

著者

• Matsumura Shinji

  Department Of Biology Keio University

• Matsumura Shinji

  Department Of Biology Tokyo Metropolitan University:department Of Biology Keio University

• KUWASAWA KIYOAKI

  Department of Bioil08y, Tokyo Metropolitan University

• Kuwasawa Kiyoaki

  Department Of Biology Tokyo Metropolitan University

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