Morphometry and ultrastructure of the squirrel monkey (Saimiri sciureus) vestibular nerve.
Morphometry and ultrastructure of the squirrel monkey (Saimiri sciureus) vestibular nerve.
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松鼠猴（Saimiri sciureus）前庭神经的形态测量和超微结构。
DOI：
10.1159/000146398
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发表时间：
1987
期刊：
影响因子：
--
通讯作者：
Igarashi,M
中科院分区：
文献类型：
--
作者：
Fermin,CD;Igarashi,M
用光学显微镜和透射电镜对塑料和环氧树脂包埋的松鼠猴前庭神经进行了观察，并进行了统计学分析。平均获得12，412个胞体和12，005个有髓神经纤维。光镜下约0.7%的胞体无髓鞘。计数约500个无髓鞘纤维。1，864个胞体的横截面积为200-650 µm2。1，346根神经纤维的轴浆横截面积为3-11 µ m2，同一纤维的髓鞘横截面积为11-12 µ m2。髓鞘厚度与神经纤维的轴浆横截面积成正比。中央轴突和外周树突的横截面积有显著性差异（p < 0.001）。外周树突的起始段通常比中央轴突的起始段更小，但更长。两个起始段的直径在第一个Ran-vier结节后增加。Schmidt-Lantermann切口中厚且有髓纤维较薄且有髓纤维较少。较大的胞体通常有较大的纤维，反之亦然，在第一个100-200 µm从第一个节点的兰维尔。有髓核和无髓核的超微结构除丘区外无显著差异，尼氏物质主要分布于胞质周围。
Vestibular nerves of squirrel monkeys(Saimiri sciureus)embedded in plastics and epoxies were examined with light microscopy (LM) and transmission electron microscopy (TEM) and computerized measures were obtained and analyzed statistically. An average of 12,412 perikarya and 12,005 myelinated nerve fibers was obtained. Approximately 0.7% of the perikarya appeared unmyelinated under LM. About 500 unmyelinated fibers were counted. The cross-sectional area of 1,864 perikarya was 200–650 µm2. The cross-sectional area of 1,346 nerve fibers was 3–11 µm2for the axoplasm and 11–12 µm2for the myelin sheath of the same fiber. Myelin thickness was directly proportional to the axoplasm cross-sectional area of the nerve fibers. The cross-sectional area of central axons and peripheral dendrites differed significantly (p < 0.001). The initial segments of peripheral dendrites were usually smaller, but longer than the initial segments of the central axons. Both initial segments increased in diameter after the first node of Ran-vier. Schmidt-Lantermann incisures were more abundant in thick and heavily myelinated fibers than in thin and lightly myelinated fibers. Larger perikarya usually had larger fibers and vice versa, within the first 100–200 µm from the first node of Ranvier. No major ultrastructural differences were found between myelinated and unmyelinated perikarya, except at the hillock region.The Nissl substance was preferentially located in the peripheral cytoplasm.