Mammal, oviduct (LM, Low)

Structure List Oviduct lumen Epithelial lining Muscular layer Serous coat Peritoneal cavity

CANINE OVIDUCT. The oviduct is a small muscular tube which carries the ovum from the ovary to the uterus. The open end of the tube near the ovary is the funnel shaped infundibulum. The initial part of the oviduct is the relatively wide ampulla. The remainder of the tube is called the isthmus. The tube opens into the uterus (horn) at the uterine os. The wall of the uterine tube consists of three concentric layers. a. Mucosa - the innermost layer lining the cavity of the uterine tube. The cells are simple columnar epithelium which is secretory in part and has patches of ciliated cells in others. The degree of secretion varies with the estrous cycle. b. The muscular layer consists of smooth muscle cells arranged primarily in a circular orientation, but some oblique and longitudinal bundles occur. The contraction of the muscle produces peristaltic waves to aid ovum transport. c. The serous coat is the lining of the peritoneal cavity.