Sporrong B, Clase L, Owman C H, Sjöberg N O
Am J Obstet Gynecol. 1977 Apr 15;127(8):811-7. doi: 10.1016/0002-9378(77)90110-7.
In the cat uterus, three types of axons have been indentified by electron microscopy on the basis of the appearance of the synaptic vesicles in the axon varicosities following treatment with 5-hydroxydopamine: (1) most axons were adrenergic, with numerous small osmiophilic vesicles of a diameter of approximately 50 nm. together with large (100 to 150 nm. in diameter) granules, (2) some axons contained only empty small granules together with the large granules; these are probably cholinergic, and (3) a small number of the axon varicosities had only large-sized vesicles with a moderately electron-dense content. They are interpreted as a polypeptide type of nerves ("p-terminals"). Close appositions at a distance of 25 nm. were sometimes found between the varicosities. A specialized neuromuscular connection was found: the muscle cells at "the end" of muscle bundles extended small stout processes, containing numerous myofilaments, onto a small nerve bundle, the distance being 20 to 25 nm.
在猫的子宫中，通过电子显微镜，依据用5-羟多巴胺处理后轴突膨体中突触小泡的外观，已识别出三种类型的轴突：(1) 大多数轴突是肾上腺素能的，有许多直径约50纳米的小嗜锇性小泡，以及大的（直径100至150纳米）颗粒；(2) 一些轴突仅含有空的小颗粒和大颗粒；这些可能是胆碱能的；(3) 少数轴突膨体只有大尺寸的小泡，其内容物电子密度适中。它们被解释为一种多肽类型的神经（“p-终末”）。有时在膨体之间发现相距25纳米的紧密邻接。发现了一种特殊的神经肌肉连接：肌束“末端”的肌肉细胞伸出含有许多肌丝的短粗突起，伸向一个小神经束，距离为20至25纳米。
