REPRESENTATIONS OF THE BODY-SURFACE IN CORTICAL AREAS 3B AND 1 OF SQUIRREL-MONKEYS - COMPARISONS WITH OTHER PRIMATES
REPRESENTATIONS OF THE BODY-SURFACE IN CORTICAL AREAS 3B AND 1 OF SQUIRREL-MONKEYS - COMPARISONS WITH OTHER PRIMATES
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DOI：
10.1002/cne.902110207
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发表时间：
1982-01-01
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：
SUR, M;NELSON, RJ;KAAS, JH
微电极多单元绘图技术确定了松鼠猴 S. sciureus 中央后顶叶皮层的体位组织。记录主要局限于建筑区域 3b 和 1。结果与猫头鹰（Merzenich 等人，1978）和猕猴（Nelson 等人，1980）类似研究的结果进行了比较。在松鼠猴的区域 3b 和区域 1 中发现了不同的身体表面表征。这些表征是平行组织的，因此两者都从大脑半球内壁的尾部开始，沿着外侧裂到达这些区域外侧边缘的嘴唇和口腔。这些表示也大致是彼此的镜像，因此区域 3b 中的任何皮肤表面都在区域 1 的尾部表示，并且沿着共同边界表示相似的皮肤表面。这些表述并不完全相同。腿的分割表示有所不同，因此远端腿在区域 1 中脚部外侧的皮层中表示，在区域 3b 中脚部内侧表示。与猫头鹰和猕猴相比，松鼠猴在区域 3b 和区域 1 中某些身体部位的表征方向发生了逆转。松鼠猴的面部、手臂、躯干和腿部的表征都是相反的，而手和脚的表征的方向是相同的。在猫头鹰和猕猴中，背侧干在 3b 区域中表示在嘴侧，在区域 1 中表示尾侧，在猫头鹰和猕猴中，腹侧干在 3b/1 边界处表示，而腹侧干在区域 3b 中表示在嘴侧，在区域 1 中表示尾侧，在松鼠猴中，背侧干在 3b/1 边界处表示。区域 3b 和 1 中体细胞组织的部分而非全部表示的逆转表明，这两个区域都被分为独立确定基本体细胞方向的扇区，其中一些扇区的方向在进化中受到逆转，并且区域 3b 和 1 中的匹配扇区在体细胞组织中不是独立的。
Microelectrode multiunit mapping techniques determined the somatotopic organization of postcentral parietal cortex in the squirrel monkey S. sciureus. Recordings were largely confined to architectonic areas 3b and 1. Results were compared to those from similar studies of owl (Merzenich et al., 1978) and macaque (Nelson et al., 1980) monkeys. Separate representations of the body surface were found in areas 3b and 1 of squirrel monkeys. These representations were organized in parallel, so that both proceeded from the tail on the medial wall of the cerebral hemisphere, to the lips and oral cavity on the lateral margin of these areas along the sylvian fissure. The representations were also roughly mirror images of each other so that whatever skin surface was represented rostrally in area 3b was represented caudally in area 1, and similar skin surfaces were represented along the common border. The representations were not identical. The split representations of the leg differed so that the distal leg was represented in cortex lateral to that devoted to the foot in area 1 and medial to the foot in area 3b. The representations of some body parts were reversed in orientation in both area 3b and area 1 in squirrel monkeys as compared to owl and macaque monkeys. The face, arm, trunk and leg representations were all reversed in squirrel monkeys, while the orientations of the hand and foot representations were the same. The dorsal trunk is represented rostrally in area 3b and caudally in area 1 and the ventral trunk is represented at the 3b/1 border in owl and macaque monkeys, while the ventral trunk is represented rostrally in area 3b and caudally in area 1 and the dorsal trunk is represented at the 3b/1 border in squirrel monkeys. These reversals of somatotopic organization in part but not all of the representations in areas 3b and 1 suggest that both fields are divided into sectors where the basic somatotopic orientation is independently determined, that the orientation of some of these sectors is subject to reversal in evolution, and that matching sectors in areas 3b and 1 are not independent in somatotopic organization.