Shu S Y, Bao X M, Peterson G M
Department of Neurobiology, Zhujiang Hospital, Guangzhou.
Chin Med J (Engl). 1992 Feb;105(2):102-9.
The discovery of a new subdivision in the striatum of the rat, the marginal division, has recently been reported. The marginal division is located at the caudal extent of the striatum, surrounding the rostrolateral border of the globus pallidus, and has different cellular morphology, immunohistochemistry and an efferent projection pattern from those of the main body of the striatum. In the present study, the ultrastructural organization of the marginal division was investigated. Most neuronal somata in the marginal division were fusiform in shape and had a large pale oval nucleus without in-foldings. There were four types of synapses in the marginal division: axo-somatic, axo-dendritic, axo-spinous and axo-axonic. Both symmetric and asymmetric synapses were observed on the somata, dendrites, or dendritic spines. Most of the symmetric synapses contained pleomorphic vesicles, whereas the asymmetric ones contained mainly round vesicles. Individual axo-axo-spinous synapses, which were first described in the striatum, were also observed in the marginal division. These ultrastructural characteristics distinguish the marginal division from the rest of the striatum.
最近有报道称在大鼠纹状体中发现了一个新的分区——边缘区。边缘区位于纹状体的尾部，围绕苍白球的 rostrolateral 边界，并且具有与纹状体主体不同的细胞形态、免疫组织化学和传出投射模式。在本研究中，对边缘区的超微结构组织进行了研究。边缘区的大多数神经元胞体呈梭形，有一个大的淡椭圆形细胞核，没有内褶。边缘区有四种类型的突触：轴体突触、轴树突触、轴棘突触和轴轴突触。在胞体、树突或树突棘上均观察到对称和不对称突触。大多数对称突触含有多形性囊泡，而不对称突触主要含有圆形囊泡。在边缘区也观察到了首次在纹状体中描述的单个轴轴棘突触。这些超微结构特征将边缘区与纹状体的其他部分区分开来。
