Oviducts are paired tubular structures that include: 1) the infundibulum, the membranous funnel-shaped end of each oviduct, lined with ciliated columnar epithelium, that directs ova into the ampulla; 2) the ampulla, the ovarian end of the oviduct, lined with ciliated columnar epithelial cells, that transports ova to the ampullary isthmic junction;
3) the isthmus, the straight and rigid portion of the oviduct lined primarily with secretory columnar epithelium; and
4) the ampullary isthmic junction, the site of fertilization.
The layers of tissue from the lumen include: 1) the endometrium (epithelial mucosa) ciliated or secretory columnar epithelia; 2) the lamina propria, the mucous membrane beneath the endometrium and separating it from the myometrium; 3) the myometrium, the inner circular and outer longitudinal layers of smooth muscle; 4) the perimetrium, the outer serosal layer of the oviduct; and 5) the mesosalpinx, the portion of the broad ligament that supports the oviducts.
Functions of the oviduct
Oviduct functions include:
Infundibulum aids in freeing ova from follicles and directing them into the ampulla. Ciliated cells of fimbria move ovum into ampulla. Site of sperm capacitation.
Site of embryonic development for the first 48 to 72 hours of pregnancy, except in equids. Nutrition for developing embryo prior to entry into the uterus.
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