イヌ肺動脈の知覚神経終末について(<特集>脳と神経の研究II)

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概要

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• The distribution and mode of the afferent nerve endings in the pulmonary artery were studied. The materials for research were'taken from six adult dogs and first fixed in Richardson's solution, cut into 30-40μ frozen sections, and then stained with Seto's silver impregnation method. The afferent nerve endings considered to be connected with the blood pressure reflex were classified into four types, the arborescent, the glomerular, the simple branched and the unbranched endings. The arborescent type was subdivided into the circumscribed and the diffuse subtypes. The arborizations of these subtypes were rather simpler in form and structure than the typical baroreceptors found in the aortic arch and carotid sinus, but resembled closely their functionally identical endings. These terminations were supplied by maximum-sized nerve fibers showing conspic uous change in size and meandering during their courses. While the diffuse types were restricted to the supero-posterior aspect of the pulmonary artery bifurcation, the circumscribed were found in the posterior wall of the incipient portions of the right and left pulmonary arteries. A notable feature of these baroreceptors was that they were accompanied by numerous special nuclei, the nature of which could not be determined, while the other types of ending, were mostly devoid of them. The glomerular .endings were more numerous than the others, but contained every stage of complexity from simple to intricate forms. They originated in the medium-sized or large fibers and were most abundant in the supero-posterior aspect of the bifurcatio trunci pulmonaris, but some of them were distributed also in the incipient parts of the right and left pulmonary arteries. The simple branched and unbranched endings arising mostly from the small and medium-sized fibers, and partly from the large fibers were found chiefly arranged circularly in the muscular layers, so that the pulmonary artery bifurcation and adjacent portions of the right and left pulmonary arteries were almost completely surrounded by these nerve terminations. The afferent nerve terminations described were chiefly located at the junction of the media and adventitia, and in the outer half of the media of the vessels.

• 千葉大学の論文
• 1965-11-28

著者

• 野崎 文行

  千葉大学医学部第1解剖学教室

• 福山 右門

  千葉大学医学部解剖学教室

• 伊藤 金得

  千葉大学医学部第1解剖学教室

• 金沢 勝男

  千葉大学医学部第1解剖学教室

• 伊藤 金得

  千葉大学医学部解剖学教室

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