アユ松果体の神経構成に関する組織化学的・電顕的研究〔英文〕

概要

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The nervous organization of the pineal organ of the ayu was investigated by acetylchlorinestrase (AChE) method1, 2) and electron microscopy. 313 AChE-positive nerve cells (about 5-15 υm in diameter) were densely distributed in the medial and proximal region and sparsely scattered in the lateral and distal regions of the vesicle. Usually, the larger nerve cells were located in the distal region of the vesicle, while the smaller ones in the proximal region of the vesicle and throughout the stalk. The pineal tract was composed of two types of unmyelinated nerve fibers; thicker fibers (1.3-1.8 υm in diameter) and thinner ones (0.3-0.7υm in diameter). In a cross and thin section of the pineal tract posterior to the habenular commissure, 625 thinner nerve fibers were surrounded by 39 thicker ones. Thus, the difference in number between the AChE-positive nerve cells and the nerve fibers in the pineal tract suggests a complexity of the nervous organization in the pineal organ of the fish.
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