Agranular membrane complexes in certain smooth-muscle cells of the lamina propria of the human oviduct. An electron-microscope study.

Electron-microscopic examination of 40 tubal specimens from 28 patients revealed the unexpected presence of considerable numbers of smooth-muscle cells in the lamina propria. These "fibromuscular" cells (FM) are branched and have irregular contours; others resemble fibrocytes. All have the identifying features of smooth-muscle cells: from 50 to 75 A filaments with scattered densities, plasmalemmal thickenings, and basement lamina.

Appearance of tonofilaments and absence of microtubules in human endometrial glandular epithelium. A function of estrogen activity.

In 1966, Cavazos et al.(1) carried out electron-microscopic studies of human endometrium and reported the presence of microtubules in glandular epithelial cells. This study presents evidence that no microtubules are evident at any stage of the menstrual cycle.