イヌの歯髄血管における管壁構成細胞の走査電顕的観察

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  • Scanning electron microscopy of vascular wall cells in the dog dental pulp.

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The three-dimensional morphology of smooth-muscle cells, the pericytes, and the adventitial cells of the blood vessels in the dog dental pulp was demonstrated by scanning electron microscopy after removal of the connective tissue components. From their differences in cellular morphology, five vascular segments were identified: 1) muscular arterioles with two layers of spindle-shaped and circularly oriented smooth-muscle cells; 2) terminal arterioles with one compact layer of spindleshaped and circularly oriented smooth-muscle cells; 3) precapillary arterioles with a less compact layer of branched smooth-muscle cells; 4) capillaries with widely scattered pericytes having several processes; 5) postcapillary venules with clustered pericytes.<BR>On the muscle layer of terminal arterioles, spidery cells with thick processes forming a rough meshwork were frequently observed. These cells seem to be primitive smooth-muscle cells. In the adentitial layer, a rough network of the adventitial cells with expanding long and fine processes, was observed in the arterioles but not in the capillaries nor venules. In the capillaries and the postcapillary venules, the endothelium could be seen through the intercellular spaces of pericytes. In some postcapillary venules, many spherical cells possibly representing emigrating leucocytes were observed in the intercellular spaces of the pericytes.

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