FIBER COMPOSITION OF THE RAT SCIATIC-NERVE
FIBER COMPOSITION OF THE RAT SCIATIC-NERVE
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DOI：
10.1002/ar.1092150111
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发表时间：
1986-05-01
影响因子：
--
通讯作者：
SCHMALBRUCH, H
中科院分区：
文献类型：
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作者：
SCHMALBRUCH, H
大鼠坐骨神经起源于L4-L6脊髓节段。它在转子处是单束的； 5-7 分钟后，神经向远端分裂成两束，然后分裂成四束。胫骨部分产生胫骨和腓肠神经，腓骨部分产生腓神经和穿过外侧腘绳肌以支配小腿近外侧面的皮肤分支。这些分支中轴突的数量和类型是通过正常神经的光学和电子显微照片以及去传出或交感神经切除后确定的。传出阻滞在技术上是不可行的，因为脊神经节和腹根由相同的血管丛供血。胫神经包含 1,000 个运动轴突和 3,500 个有髓鞘传入轴突、3,700 个交感神经轴突和 5,400 个无髓鞘传入轴突。腓神经包含 600 个运动轴突和 1,300 个有髓鞘传入轴突、1,100 个交感神经轴突和 3,000 个无髓鞘传入轴突。 腓肠神经包含 1,100 个有髓鞘和 2,800 个无髓鞘传入轴突；此外，还有1,500个无髓鞘交感神经轴突。皮肤分支由 400 个有髓鞘和 1,800 个无髓鞘传入轴突组成。因此，大腿中部的整个坐骨神经由大约 27,000 个轴突组成； 6% 是有髓鞘运动轴突，23% 和 48% 分别是有髓鞘和无髓鞘感觉轴突，23% 是无髓鞘交感轴突。使用的技术没有显示皮肤分支中的交感轴突，也没有显示腓肠神经中包含的少数运动轴突。
The rat sciatic nerve originates from the spinal segments L4-L6. It is unifascicular at the trochanter; 5-7 min distally, the nerve splits into two and then into four fascicles. The tibial portion gives rise to the tibial and the sural nerves, and the peroneal portion gives rise to the peroneal nerve and a cutaneous branch that perforates the lateral hamstring muscles to innervate the proximolateral face of the calf. The number and type of the axons in these branches were determined in light and electron micrographs of normal nerves, and after de-efferentiation or sympathectomy. Deafferentiation was technically not feasible because spinal ganglia and ventral roots were supplied by the same vascular plexus. The tibial nerve contained 1,000 motor and 3,500 myelinated afferent axons, 3,700 sympathetic axons, and 5,400 unmyelinated afferent axons. The peroneal nerve contained 600 motor and 1,300 myelinated afferent axons, 1,100 sympathetic axons and 3,000 unmyelinated afferent axons. The sural nerve contained 1,100 myelineated and 2,800 unmyelinated afferent axons; in addition, there were 1,500 unmyelinated sympathetic axons. The cutaneous branch consisted of 400 myelinated and 1,800 unmyelinated afferent axons. Thus, the entire sciatic nerve at midthigh is composed of about 27,000 axons; 6% are myelinated motor axons, 23% and 48% are myelinated and unmyelinated sensory axons, respectively, and 23% are unmyelinated sympathetic axons. The techniques used did not demonstrate sympathetic axons in the cutaneous branch and did not reveal the few motor axons contained in the sural nerve.