An Electron Microscopic Study on the Subcommissural Organ of the Monkey, Macacus fuscatus
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The subcommissural organ of the adult Japanese red-faced monkey (Macacus fuscatus) was studied by electron microscope.In the ependymal cells of the subcommissural organ two types of secretory substances are demonstrated: one, containing a fine flocculent substance, is light secretory sacs which are derived from the rough-surfaced endoplasmic reticulum located near the perikaryon. The other, filled with homogenously distributed material, is represented by dense secretory granules which are probably produced in the Golgi apparatus through condensation of the content of the rough-surfaced endoplasmic reticulum. Both may be released into the ventricular lumen to form the so-called Reissner fibre (apical secretion).The end-feet of the ependymal cells abutting on the capillaries are characterized by an accumulation of dense bodies of various sizes, some of which can be discerned by acid phosphatase activity. The nature and significance of these dense bodies were discussed in relation to the basal secretion possible in this organ.In the acid phosphatase preparation, the enzyme activity is also present in the Golgi apparatus, lipofuscin granules as well as typical lysosomal particles scattered in the cytoplasm, while the light secretory sacs and the dense secretory granules show little or no reactivity. In the hypendyma located underneath the ependymal cells there are perivascular spaces of varying widths and occasionally secretory hypenymal cells which are similar to the ependymal cells in structure. The capillary endothelial cells frequently contain dense granules resembling dense bodies or dense secretory granules found in the cells of the subcommissural organ.
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国際組織細胞学会 | 論文
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