Figure 2217

Schematic diagram illustrating arterial blood supply to the endometrium of the uterus. The two layers of the endometrium, the stratum basale and stratum functionale, are supplied by branches of the uterine artery. The spiral arteries located at the interface between these two layers degenerate and regenerate during the menstrual cycle under the influence of estrogens and progesterone. (Based on Weiss L, ed. Cell and Tissue Biology: A Textbook of Histology. 6th ed. Baltimore: Urban & Schwarzenberg, 1988.)

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