向猫脊髓腰中部节段有上行投射的Ⅱ组激活型腰骶中间神经元。
Group II-activated lumbosacral interneurones with an ascending projection to midlumbar segments of the cat spinal cord.
作者信息
Harrison P J, Riddell J S
机构信息
Department of Physiology, University College London.
出版信息
J Physiol. 1989 Jan;408:561-70. doi: 10.1113/jphysiol.1989.sp017476.
Abstract
- In anaesthetized cats, single-unit microelectrode recordings were made in the lateral funiculus at L6, from the axons of lumbosacral interneurones discharged by hindlimb group II muscle afferents. 2. The level of the ascending projection of these interneurones was investigated by antidromic activation of their axons in the lateral funiculus from different spinal levels. The majority of units encountered were found to have an ascending projection to at least the L4 level and, of these, most (85%) did not project beyond the L4 or L3 segments of the cord. 3. The axons studied were discharged by group II afferents primarily from knee extensor muscles. Some units were discharged in addition by cutaneous and/or joint afferents. 4. The implications of this ascending projection are discussed.
摘要
- 在麻醉猫中，从腰荐中间神经元的轴突进行单单位微电极记录，这些轴突由后肢Ⅱ类肌肉传入纤维放电，记录部位在L6节段的外侧索。2. 通过在不同脊髓节段从外侧索逆向激活这些中间神经元的轴突，研究了它们的上行投射水平。发现大多数遇到的单位至少有一个上行投射到L4节段，其中大多数（85%）没有投射到脊髓的L4或L3节段以上。3. 所研究的轴突主要由Ⅱ类传入纤维从膝关节伸肌放电。一些单位还由皮肤和/或关节传入纤维放电。4. 讨论了这种上行投射的意义。
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