An ultrastructural study of the rat myometrium revealed the presence of a number of nerve bundles, many of which were associated with either muscle cells or blood vessels. The nerve fibers were found to contain agranular and granular vesicles of widely varying proportions and the spatial relationship between nerve fibers and muscle cells in the myometrium was comparable to that found in smooth muscle generally.A study of regions of close apposition between muscle cells showed three types of "cellular contacts." In the first type the opposing muscle cells are separated by a gap of about 200A with filamentous structures extending across the gap. In the second type the opposing plasma membrane are in direct contact. The third type consists of regions of cytoplasmic continuity between adjacent cells. It is suggested that the "cellular contacts" provide a path for impulse transmission between muscle cells.
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