REPRESENTATIONS OF THE BODY-SURFACE IN POSTCENTRAL PARIETAL CORTEX OF MACACA-FASCICULARIS
REPRESENTATIONS OF THE BODY-SURFACE IN POSTCENTRAL PARIETAL CORTEX OF MACACA-FASCICULARIS
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DOI：
10.1002/cne.901920402
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发表时间：
1980-01-01
影响因子：
2.5
通讯作者：
KAAS, JH
中科院分区：
文献类型：
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作者：
NELSON, RJ;SUR, M;KAAS, JH
通过多单元微电极记录确定了旧世界猴束状支原体中央后顶叶皮层的体位组织。中央后回皮质中至少有 2 个完整且系统的对侧体表表征。一个表示包含在区域 3b 内，另一个表示包含在区域 1 内。虽然这两个表示的组织存在重要差异，但它们基本上是彼此的镜像。每个表征通过某些中外侧区域的皮质邻接来维持体表邻接。在其他区域，可以描述两种类型的不连续性。第一，其中相邻的身体表面由单独的皮质位点表示；第二，其中相邻的皮质区域代表不同的体表区域。每个表征的内部组织最好被描述为体位区域的复合体（Merzenich），而不是皮节带的串行阵列或小人。虽然结构区域 2 对深层身体组织的刺激做出反应，但区域 2 的至少部分区域对皮肤刺激做出反应。区域 2 中手部皮肤表征的组织基本上是区域 1 中手部表征的镜像，区域 3a 是由深层身体组织刺激激活的，这表明在猕猴体感皮层的传统 SI 区域内可能存在第四个身体表征。根据之前对新世界猴 (Merzenich) 的研究，区域 3b 中的皮肤表征应被视为 SI 固有区域，区域 1 中的皮肤表征应被称为后皮肤区域。基于体表表征的方向和其他因素，区域 3b 中的表征与非灵长类动物中的 SmI（或 SI）同源。
The somatotopic organization of the postcentral parietal cortex of the Old World monkey, M. fascicularis, was determined with multi-unit microelectrode recordings. There are at least 2 complete and systematic representations of the contralateral body surface in the cortex of the postcentral gyrus. One representation is contained within Area 3b, the other within Area 1. While there are important differences in the organization of the 2 representations, they are basically mirror-images of each other. Each representation maintains body-surface adjacency by cortical adjacency in some mediolateral regions. In other regions, 2 types of discontinuities can be described. 1st, in which adjacent body surfaces are represented in separate cortical loci; 2nd, in which adjacent cortical regions represent disparate body-surface regions. The internal organization of each representation is better described as a composite of somatotopic regions (Merzenich) than as a serial array of dermatomal bands or as a homunculus. While architectonic Area 2 responds to stimulation of deep body tissue, at least parts of Area 2 respond to cutaneous stimulation. The organization of the cutaneous representation of the hand in Area 2 is basically a mirror-image of the hand representation in Area 1 and Area 3a is activated by deep body tissue stimulation, suggesting the possibility of a 4th body representation within the traditional SI region of somatosensory cortex in macaques. In accord with a previous study in a New World monkey (Merzenich), the cutaneous representation in Area 3b should be considered as SI proper and the cutaneous representation in Area 1 should be termed the posterior cutaneous field. Based on the orientation of the representations of the body surface and other factors, the representation in Area 3b is homologous to SmI (or SI) in non-primates.