600 



GENITAL ORGANS OF THE MARE 



abdominal cavity, but extends a short distance into the pelvic cavity. It is at- 

 tached to the sublumbar region and the lateral walls of the pelvic cavity by two 

 folds of peritoneum termed the broad ligaments. It consists of two horns, the body, 

 and the neck. 



The horns or comua of the uterus (Cornua uteri) are situated entirely in 

 the abdomen. They appear to vary considerably in position; commonly they 

 are pressed up against the sublumbar muscles by the intestine (csecum, left parts of 



Fig, 533. — Genital Organs of Mare; Dorsal View 

 The left horn and adjacent part of the body of the uterus and the vagina and vulva are opened up. 7, Ovary; 2y 

 uterine tube, with 2' , ita ovarian end; 5, cavity of body of uterus; 4, cavity of left horn; 5, right horn, with 5' , its com- 

 munication with the body ; 5, portio vaginalis uteri; 6', external orifice of uterus; 7, broad ligament of uterus; ,5, liga- 

 ment of ovary; 9, vagina; 10, vulva; 10', orifices of ducts of glandulge vestibulares majores; 10", orifices of ducts of 

 glandulEe vestibulares minores; 11, transverse fold; 12, external urethral opening; 13, IS', labia vulvae; 14, glans 

 clitoridis; 14', junction of crura to form corpus clitoridis indicated by dotted lines; 15, urinary bladder; a, utero- 

 ovarian artery with ovarian ia') and uterine {a") branches; h, middle uterine artery. (After Ellenberger, in Leisering's 

 Atlas.) 



» 



large colon, small colon, and small intestine). They are cylindrical when moder- 

 ately distended, and are about ten inches (ca. 25 cm.) in length. The anterior 

 extremity of each forms a blunt point which receives the uterine tube. Posteriorly 

 they increase somewhat in caliber, converge, and unite Avith the body. The dorsal 

 border (Margo mesometricus) is slightly concave and is attached to the sublumbar 

 region by the broad ligament. The ventral border (Margo liber) is convex and free. 



When a soft uterus is distended, its horns are strongly curved, but this does not represent 

 the natural form. When fixed in situ, the horns are either slightly curved or nearly straight. 



