spiral arteries

spiral arteries
spiral endometrial arteries tightly coiled branches of the uterine radial arteries, which supply the endometrium and in pregnancy supply blood to the intervillous space. During the secretory phase of the menstrual cycle they become more prominent; if pregnancy does not occur, they become constricted, with consequent necrosis of the endometrial tissues that results in menstruation.

Medical dictionary. 2011.

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  • Menstrual cycle — The monthly cycle of changes in the ovaries and the lining of the uterus (endometrium), starting with the preparation of an egg for fertilization. When the follicle of the prepared egg in the ovary breaks, it is released for fertilization and… …   Medical dictionary

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