Kobayashi N, Sawabe Y, Matsumoto K, Otsuka N, Goto N
Department of Neurosurgery, Showa University School of Medicine, Tokyo, Japan.
Okajimas Folia Anat Jpn. 1998 Mar;74(6):329-35. doi: 10.2535/ofaj1936.74.6_329.
Unmyelinated nerve fibers of the abducent nerve have occasionally been observed with electron microscopes, but, to our knowledge, they have never been evaluated from the morphometric point of view. We analyzed the aging process of the unmyelinated nerve fibers in the human abducent nerve with the help of a new staining method suitable for morphometric research on the nervous system. We studied numbers and transverse areas of unmyelinated fibers of the abducent nerve in 10 cadavers. Our findings were that (1) these fibers were distributed diffusely, (2) their number decreased with age, and (3) the mean transverse area did not change with age. Most of the unmyelinated axons were thinner than the myelinated axons. These results may be important for analysis of clinical signs in relation to aging and ophthalmologic functions.
用电子显微镜偶尔能观察到展神经的无髓神经纤维，但据我们所知，从未从形态计量学角度对其进行评估。我们借助一种适用于神经系统形态计量学研究的新染色方法，分析了人类展神经中无髓神经纤维的老化过程。我们研究了10具尸体展神经无髓纤维的数量和横截面积。我们的发现是：（1）这些纤维呈弥漫性分布；（2）其数量随年龄增长而减少；（3）平均横截面积不随年龄变化。大多数无髓轴突比有髓轴突细。这些结果对于分析与衰老和眼科功能相关的临床体征可能具有重要意义。
