ORGANIZATION OF CORTICOCORTICAL CONNECTIONS IN PARIETAL CORTEX OF RAT
ORGANIZATION OF CORTICOCORTICAL CONNECTIONS IN PARIETAL CORTEX OF RAT
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DOI：
10.1002/cne.901810305
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发表时间：
1978-01-01
影响因子：
2.5
通讯作者：
Killackey, HP
中科院分区：
文献类型：
--
作者：
Akers, RM;Killackey, HP
基于Nissl，顺行变性，和琥珀酸脱氢酶组织化学技术的分析表明，有两个不同的区域顶叶皮质的特点是不同的cytoarchitectonic功能和解剖连接。“颗粒”皮质区具有由小而密集的细胞组成的明确的第四层，接受来自丘脑腹后核的密集投射，并且基本上没有胼胝体输入。围绕或嵌入颗粒区的“无颗粒”皮质区缺乏明确的第四层，接受来自腹后核的稀疏投射，但发送和接收广泛的胼胝体投射。这些发现表明，丘脑和胼胝体的投射顶叶皮层保持区域分离的模式。颗粒皮质区，这显然对应于SmI，项目同侧运动皮质，SmII，和相邻的无颗粒区。颗粒皮质的表层也大量投射在底层V上。这种皮质内投射在“桶场”皮质内不以离散的簇组织。这表明，专门组织的丘脑传入和颗粒细胞内的“桶场”是不维持在该地区的皮质内电路。
An analysis based on Nissl, anterograde degeneration, and sucinic dehydrogenase histochemical techniques reveals that there are two distinct regions of parietal cortex which are characterized by different cytoarchitectonic features and anatomical connections. The “granular” cortical zone possesses a well‐defined fourth layer composed of small, densely‐packed cells, receives dense projections from the ventral posterior nucleus of the thalamus, and is essentially free of callosal inputs. “Agranular” cortical areas which surround or lie embedded within the granular zone lack a well‐defined fourth layer, receive sparse projection from the ventral posterior nucleus, but send and receive extensive callosal projections. These findings suggest that thalamic and callosal projections to the parietal cortex maintain a pattern of areal segregation. The granular cortical zone, which apparently corresponds to SmI, projects ipsilaterally to motor cortex, SmII, and adjacent agranular areas. The superficial layers of the granular cortex also project heavily upon the underlying layer V. This intracortical projection is not organized in discrete clusters within the “barrel field” cortex. This suggests that the specialized organization of thalamic afferents and granule cells within the “barrel field” is not maintained in the intracortical circuitry of this region.