The terminations of single, physiologically identified, somatosensory, corticospinal tract axons in the lumbar spinal cord of the cat.
The terminations of single, physiologically identified, somatosensory, corticospinal tract axons in the lumbar spinal cord of the cat.
复制标题
猫腰脊髓中单个、生理学上鉴定的体感皮质脊髓束轴突的末端。
DOI：
10.1152/jn.1991.66.5.1738
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发表时间：
1991
影响因子：
2.5
通讯作者：
Light,AR
中科院分区：
文献类型：
--
作者：
Casale,EJ;Light,AR
1.在猫脊髓左侧背外侧索内记录到212个皮质脊髓轴突，平均传导速度为38 m/s，范围为9-113 m/s。2.接受野的电刺激诱发皮质脊髓轴突放电，平均潜伏期为36 ms（范围9-100 ms）。3.记录的212个轴突中，有109个通过辣根过氧化物酶离子电泳注射成功进行轴突内标记，标记轴突的平均长度为4.8 mm。73个标记轴突没有发出侧支，36个发出至少一个标记侧支。沿着母轴突的标记部分沿着进入脊髓灰质。4.大多数标记的轴突只发出一个标记的侧支脊髓节段。来自10个单位的14条侧支被标记得足够好，以允许重建其末端分支。5.大多数终端侧支定向喙尾和终止于层V，VI和VII。大多数侧支终止于灰质的大的中外侧范围内，没有明显的地形组织。6.没有侧支终止于第一层或第二层或运动神经元池内，它们的解剖和生理特征之间没有明显的相关性。
1. Two hundred and twelve corticospinal axons were identified by stimulation in the hindlimb representation in area 3b of the somatosensory cortex and were recorded in the left dorsolateral funiculus of the spinal cord of the cat. The mean conduction velocity was 38 m/s, range 9-113 m/s. 2. Electrical stimulation of the receptive field evoked discharge in corticospinal axons with a mean latency of 36 ms (range 9-100 ms). 3. One hundred nine of the 212 recorded axons were successfully intra-axonally labeled by iontophoretic injection of horseradish peroxidase, with the mean length of labeled axon being 4.8 mm. Seventy-three of the labeled axons issued no collaterals, and 36 issued at least one labeled collateral into the spinal gray matter along the labeled portion of the parent axon. 4. Most labeled axons issued only one labeled collateral per spinal cord segment. Fourteen collaterals from 10 units were labeled well enough to permit reconstruction of their terminal arborizations. 5. Most terminal collaterals were oriented rostrocaudally and terminated in laminae V, VI, and VII. Most collaterals terminated within large mediolateral extents of the gray matter with no apparent topographic organization. 6. No collaterals terminated in laminae I or II or within the motoneuron pools, and no apparent correlation was found between their anatomic and physiological characteristics.