Somatosensory thalamocortical connections in the raccoon: an HRP study.
Somatosensory thalamocortical connections in the raccoon: an HRP study.
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浣熊的体感丘脑皮质连接：一项 HRP 研究。
DOI：
10.1002/cne.902270411
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发表时间：
1984
期刊：
影响因子：
--
通讯作者：
PubolsJr,BH
中科院分区：
文献类型：
--
作者：
Warren,S;PubolsJr,BH
在北美浣熊（Procyon lotor）中，在丘脑腹基底复合体（VB）的单独亚核和躯体感觉皮层（SmI）的单独亚回中发现了手指无毛表面的表征。在本研究中，辣根过氧化物酶从SmI到VB的逆行运输被用来研究生理学上确定的皮质subgyri和somatotopically相应的丘脑subnucleus.Single大或多个小注射局限于一个单一的回冠导致逆行标记的大集团的细胞填充整个VB亚核为适当的数字之间的关系。总体而言，标签区域表现为在背腹侧和前后方向延伸的薄楔形片，但内侧变平，弯曲形成侧向凸形;这些似乎与其他人描述的猴VB的椎板相对应。这些大量注射导致板层内约80%的所有大（直径18-30 μm）细胞被标记。单个，小，局灶性注射的脑回冠导致变量的标签，从整个数字板，只有一个小的焦点群集的细胞。没有证据表明存在前后延伸的“杆”的细胞，在灵长类动物中的报告。最后，有一个稀疏的，但一致的标记后核组（Po）的细胞后回crowninjections.These结果是一致的预期的基础上先前的电生理研究的浣熊VB和SmI，以及先前的解剖研究丘脑皮质的关系。
In the North American raccoon (Procyon lotor), representations of the glabrous surfaces of the hand digits are found within separate subnuclei of the thalamic ventrobasal complex (VB) and on separate subgyri of the somatosensory cortex (SmI). In the present study, the retrograde transport of horseradish peroxidase from SmI to VB was utilized to study relationships between physiologically identified cortical subgyri and somatotopically corresponding thalamic subnuclei.Single large or multiple small injections confined to a single gyral crown led to retrograde labeling of large groupings of cells filling the entire VB subnucleus for the appropriate digit. In the aggregate, the regions of label appeared as thin, wedge‐shaped sheets extended in the dorsoventral and anteroposterior dimensions, but flattened mediolaterally, and curving to form a laterally directed convexity; these appear to correspond to the lamellae of monkey VB described by others. These large injections led to labeling of approximately 80% of all large (18–30‐μm diameter) cells within the lamella. Single, small, focal injections of a gyral crown led to variable amounts of labeling, ranging from an entire digital lamella to only a small focal cluster of cells. No evidence was obtained for the existence of anteroposteriorly extending “rods” of cells, as reported in primates. Finally, there was a sparse, but consistent labeling of cells of the posterior nuclear group (Po) following gyral crown injections.These results are in agreement with expectations based on prior electrophysiological studies of raccoon VB and SmI, as well as prior anatomical studies of thalamocortical relationships.