Pattern of segmental monosynaptic input to cat dorsal neck motoneurons.
Pattern of segmental monosynaptic input to cat dorsal neck motoneurons.
复制标题
猫背颈运动神经元的节段单突触输入模式。
DOI：
10.1152/jn.1981.46.3.496
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发表时间：
1981
影响因子：
2.5
通讯作者：
Wilson,VJ
中科院分区：
文献类型：
--
作者：
Brink,EE;Jinnai,K;Wilson,VJ
颈背肌被腱铭文部分细分，并接受多达四个脊柱节段的神经支配 (27)。这种形态为研究从纺锤体初级（Ia）传入到支配这些肌肉的运动神经元的输入提供了一个有趣的机会。已经提出了两种截然不同的输入组织模式。传入神经在特定节段水平进入脊髓的纺锤体在肌肉内具有局部分布 (29) 和颈部肌肉可能是区室化功能的好例子：来自特定区域中纺锤体的 Ia 传入仅投射到支配该区域的运动神经元 (7, 30)。相反，正如在后肢节段中一样，每个 Ia 传入神经元可以投射到大多数肌肉的运动神经元 (22, 23, 33)，并且，正如 Rapoport (25, 26) 所建议的，每个运动神经元因此可以将来自支配肌肉的几个节段的 Ia 输入相加。我们实验的目的是区分这些替代方案。其中一些结果以摘要形式呈现（8）。
Dorsal neck muscles are partially subdivided by tendinous inscriptions and receive their innervation from as many as four spinal segments (27). This morphology presents an interesting opportunity for study of the input from spindle primary (Ia) afferents to the motoneurons innervating these muscles. Two very different patterns of organization of this input have been proposed. Spindles whose afferents enter the spinal cord at a particular segmental level have a localized distribution within the muscle (29) and neck muscles may be good examples of compartmentalized function: Ia-afferents from spindles in a specific region project only onto motoneurons innervating that region (7, 30). Conversely, as in the hindlimb segments, each Ia-afferent may project to most of the muscle’s motoneurons (22, 23, 33) and, as suggested by Rapoport (25, 26), each motoneuron may therefore sum Ia input from several of the segments that innervate the muscle. The purpose of our experiments was to distinguish between these alternatives. Some of these results have been presented in abstract form (8).