STRUCTURE OF THE PIRIFORM CORTEX OF THE OPOSSUM .1. DESCRIPTION OF NEURON TYPES WITH GOLGI METHODS
STRUCTURE OF THE PIRIFORM CORTEX OF THE OPOSSUM .1. DESCRIPTION OF NEURON TYPES WITH GOLGI METHODS
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DOI：
10.1002/cne.902130205
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发表时间：
1983-01-01
影响因子：
2.5
通讯作者：
HABERLY, LB
中科院分区：
文献类型：
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作者：
HABERLY, LB
用快速高尔基和Golgi-Cox技术对成年负鼠梨状皮质进行了研究。第II层和第III层深层的大多数锥体细胞类似于大脑皮层其他部分的锥体细胞，具有单一的顶端树突干、多个基底树突、大量的小至中等树突棘和深定向轴突。在第二层的表面部分的锥体细胞是相似的，除了次级顶端树突往往出现直接从细胞体，而不是从一个单一的初级干。保守的分类标准，9种不同类型的非锥体细胞进行了区分，其中4个以前没有被描述。第一层含有少量的神经元与光滑和多刺的树突，包括独特的梭形细胞与大型躯体附属物。与其他物种一样，第二层中最常见的非锥体神经元类型是半月细胞，它只有顶端定向的树突。这些细胞有独特的大刺局限于其远端树突节。第三层的中深部含有具有光滑树突的多极神经元，类似于新皮质中众所周知的大星状细胞。层III包含3种具有多刺树突的非锥体神经元类型：具有复杂的分支树突附属物和体刺的梭形和多极细胞;具有大直径树突的非常大的多极细胞（平均直径高达35 μ m），其产生突然变细的侧支和丝状刺;具有大量多刺树突的多极细胞。在所有3层中，发现小神经元具有球形细胞体和轴突状树突，类似于在各种大脑区域中描述的所谓神经胶质样神经元。梨状皮质组织结构的一个显著特征是，除了神经胶质样神经元外，不同类型的非锥体细胞倾向于分离在单独的层或亚层中。生理影响的结果进行了讨论。还提出了关于梨状皮质作为模型皮质系统的潜力的意见。
The piriform cortex was studied in the adult opossum with rapid Golgi and Golgi-Cox techniques. Most pyramidal cells in the deep part of layer II and layer III resemble those in other parts of the cerebral cortex by virtue of a single apical dendritic trunk, multiple basal dendrites, a large number of small to medium dendritic spines and a deeply directed axon. Pyramidal cells in the superficial part of layer II are similar with the exception that secondary apical dendrites often emerge directly from the cell body rather than from a single primary trunk. With conservative criteria for categorization, 9 different types of nonpyramidal cells were distinguished, 4 of which have not been previously described. Layer I contains a smaller number of neurons with both smooth and spiny dendrites including distinctive fusiform cells with large somatic appendages. As in other species, the most common type of nonpyramidal neuron in layer II is the semilunar cell which has only apically directed dendrites. These cells have distinctive large spines confined to their distal dendritic segments. The mid to deep portion of layer III contains multipolar neurons with smooth dendrites that resemble the well-known large stellate cells in neocortex. Layer III contains 3 nonpyramidal neuron types with spiny dendrites: fusiform and multipolar cells with complex, branched dendritic appendages and somatic spines; very large multipolar cells (up to 35 .mu.m mean diameter) with large-diameter dendrites that give rise to abruptly tapering side branches and filiform spines; multipolar cells with profusely spiny dendrites. In all 3 layers, small neurons were found with spherical cell bodies and axoniform dendrites that resemble the so-called neurogliaform neurons described in a variety of brain areas. A striking feature of the organization of the piriform cortex is that, with the exception of the neurogliaform neurons, the different types of nonpyramidal cells tend to be segregated in individual layers or sublayers. Physiological implications of the results are discussed. Remarks are also made concerning the potential of the piriform cortex as a model cortical system.