ニジマス迷走神経心臓枝の機能と節前神経細胞体の位置〔英文〕

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The function of cholinergic vagal innervation and the locality of its preganglionic neurons were investigated using in situ preparations of the rainbow trout heart.The cardiac-visceral branches of the vagus were identified by vagal stimulation. The stimulation induced intense bradycardia with frequencies between 10 and 100Hz, while tachycardia was never produced even after atropinization, indicating that only the cholinergic vagus nerves were stimulated in the study. Subsequent beta-adrenoceptor blockade by propranolol intensified the stimulation-induced cardiac inhibition. It is suggested that the serum catecholamine levels in the preparations were kept high by secretion from chromaffin tissues and they produced a chronotropic acceleratory effect to the heart during the experiment.A group of preganglionic neurons of the cardiac-visceral trunk of the vagus were identified in the vagal motor nucleus of the medulla by retrograde labeling with HRP. They formed a longitudinal column within the nucleus at the level around the obex.
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