The neuronal composition of area 17 of rat visual cortex. I. The pyramidal cells
The neuronal composition of area 17 of rat visual cortex. I. The pyramidal cells
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大鼠视觉皮层17区的神经元组成。
DOI：
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发表时间：
1985
期刊：
影响因子：
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通讯作者：
Daniel A. Kara
中科院分区：
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作者：
A. Peters;Daniel A. Kara
使用高尔基体制剂和半薄塑料切片通过光学显微镜和电子显微镜检查了大鼠视觉皮层区域 17 中的锥体细胞。锥体细胞的细胞体位于 II-VIa 层。 II/III 层下部的锥体细胞是这种神经元类型的典型例子，因为它们具有锥体形的细胞体、上升到 I 层的顶端树突和基底树突的裙部。上层II/III中的锥体细胞在形式上相似，但具有较短的顶端树突，而最表层的锥体细胞缺乏顶端树突，而是具有两个或多个从其体细胞的上表面发出的初级树突。在第五层中，锥体细胞有两种大小，中型和大型，并且都具有典型的形态，尽管较大的神经元比中型锥体具有更厚的顶端树突和更发达的轴突小丘。 V 层中型锥体细胞的数量多于大型锥体细胞，比例为 2.5:1。在第四层中存在一些典型的中等大小的锥体细胞，但大多数都很小，可以被视为星形金字塔，因为它们具有向各个方向辐射的树突。在第四层中没有遇到明确识别的多刺星状细胞。 VIa层的锥体细胞也很小，并且大多数具有仅上升至IV层的顶端树突。除了这些变体之外，还遇到了倒置和水平倾斜的锥体细胞。
The pyramidal cells in area 17 of rat visual cortex have been examined by light microscopy using Golgi preparations and semithin plastic sections, and by electron microscopy. Pyramidal cells have cell bodies in layers II–VIa. The pyramidal cells in the lower portion of layer II/III are typical examples of this neuronal type in that they have pyramidal‐shaped cell bodies, apical dendrites which ascend to layer I, and a skirt of basal dendrites. The pyramidal cells in upper layer II/III are similar in form but have shorter apical dendrites, while the most superficial pyramidal cells lack apical dendrites and instead have two or more primary dendrites that emanate from the upper surface of their somata. In layer V the pyramidal cells are of two sizes, medium and large, and both have a typical morphology, although the larger neurons have thicker apical dendrites and better‐developed axon hillocks than the medium‐sized pyramids. The medium‐sized pyramidal cells of layer V outnumber the large ones to a ratio of 2.5:1. In layer IV a few typical medium‐sized pyramidal cells are present, but the majority are small and can be regarded as star pyramids for they have dendrites radiating in all directions. No clearly identified spiny stellate cells have been encountered in layer IV. The pyramidal cells of layer VIa are also small, and most of them have apical dendrites which only ascend as far as layer IV. In addition to these varieties, both inverted and horizontally inclined pyramidal cells have been encountered.