The rat corpus striatum was perfused vitally with glutaraldehyde, immersed in OsO4 and then observed under an electron microscope. Numerous small cells in the neostriatum show a simple cytoplasmic structure, while the large cells possess a complicated fine structure. These are differentiated under the elctron microscope into two kinds, which seem to have functional differences. The large pallidal cells containing much pale cytoplasm are covered with many varied axonal boutons from the cell body to the dendritic terminal making numerous axo-somatic or axo-dendritic trunk synapses. Numerous axo-dendritic, or spine synapses are recognized in the neostriatal neuropil. These numerous axon terminals, which belong to striatal nerve cells or other nuclei of the brain, are classified morphologically into several types. At least five types of synaptic vesicles are distinguished by their size or by the presence of fine dense granules on their membranes, and seem to be specific to the neostriatum. Many myelin interruptions and several kinds of glial cells in the corpus striatum are observed. Moreover, the ventricular wall of the caudate nucleus, namely, the ependyma, and two kinds of subependymal cells are described and discussed with reference to the subependymal layer.
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