MORPHOLOGICAL CHARACTERIZATION OF SLOW AND FAST PYRAMIDAL TRACT CELLS IN THE CAT
MORPHOLOGICAL CHARACTERIZATION OF SLOW AND FAST PYRAMIDAL TRACT CELLS IN THE CAT
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DOI：
10.1016/0006-8993(79)90693-0
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发表时间：
1979-01-01
期刊：
影响因子：
2.9
通讯作者：
LANDRY, P
中科院分区：
文献类型：
--
作者：
DESCHENES, M;LABELLE, A;LANDRY, P
在成年猫的慢和快锥体束（Pt）神经元的形态进行了研究细胞内HRP [辣根过氧化物酶]注射和高尔基体浸渍。两种神经元均为锥体细胞，其索马体均位于运动区第5层。作为一项规则，快Pt神经元有较大的胞体和他们的基底和顶端树突占据了较大的领土在切平面。在第I层，快Pt神经元的终末顶树突光滑，分裂较差，而慢Pt神经元的终末顶树突具有中等数量的棘和丰富的分支。在第3层，在软脑膜和第V层之间的中间，两种类型的Pt细胞的顶轴向上运行，很少分支。这些轴在快Pt细胞中更多（7至16），并且它们几乎没有刺。第III层中的慢Pt细胞数量在5到9个之间，并且被棘密集覆盖。Pt慢神经元和Pt快神经元的水平支和斜支在第V层内延伸，部分神经元侵入第III层下部。这表明，该区域对应于运动区的真正第四层。在这两种类型的细胞斜和侧枝承担许多刺。在基底树突状领土的铂细胞，2树突状系统：一个短的和一个长的，可以区分。前者斜向下传播，似乎仍然在第V层。后者是由长下降垂直（antiapical）和倾斜的树突（主根）。虽然这两种类型的细胞可能有长的antiapical树突，径向向下运行到下部的第六层，主根树突，横向扩展低于细胞体相当大的距离是一个显着的特点快Pt神经元。虽然所有铂细胞的基底树突承担刺，其数量，分布和形状是非常可变的快铂细胞。
In adult cats the morphology of slow and fast pyramidal tract (Pt) neurons was studied following intracellular HRP [horseradish peroxidase] injections and Golgi impregnation. Both types of neurons are pyramidal cells and their soma are all located in the 5th layer of the motor area. As a rule, fast Pt neurons have larger somata and their basal and apical dendrites occupy a larger territory in the tangential plane. In layer I, terminal apical dendrites of fast Pt neurons are smooth and divide poorly while those of slow Pt neurons bear a moderate amount of spines and branch profusely. Midway between the pia and layer V, in the 3rd layer, the apical shafts of both types of Pt cells run upward with little branching. These shafts are more numerous in fast Pt cells (7 to 16) and they are almost devoid of spines. Those of slow Pt cells in layer III number between 5 and 9 and are densely covered with spines. Oblique and horizontal branches of slow and fast Pt neurons extend in layer V and some of them invade the lower part of layer III. It is suggested that this zone corresponds to a true 4th layer in the motor area. In both types of cells oblique and lateral branches bear numerous spines. Within the basal dendritic territory of Pt cells, 2 dendritic systems: a short and a long one, may be distinguished. The former spreads downward obliquely and appears to remain within layer V. The latter is made up of long descending vertical (antiapical) and oblique dendrites (tap root). While both types of cells may have long antiapical dendrites that run down radially to the lower part of layer VI, tap root dendrites which expand laterally below the cell body for considerable distances are a distinctive feature of fast Pt neurons. Although basal dendrites of all Pt cells bear spines, their number, distribution and shape are very variable in fast Pt cells.