Figure 2123

Photomicrograph of human ductus epididymis. This higher magnification of the rectangular area in Figure 21.22 reveals the two cell types of the epididymal epithelium, the principal cells and the basal cells. Stereocilia (arrows) extend from the apical surface of the principal cells. The nuclei of the basal cells are spherical and are located in close proximity to the basement membrane, whereas the nuclei of the principal cells are cylindrical and conform to the columnar shape of the cell. Surrounding the duct epithelium is a layer of circularly arranged smooth muscle cells. The duct lumen contains numerous sperm. x250.

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