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 cornua 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 (cecum, left parts of 
* Fic. 533.—GernITAL OrGANS OF Mare; Dorsat View 
The left horn and adjacent part of the body of the uterus and the vagina and vulva are opened up. 1, Ovary; 2, 
uterine tube, with 2’, its ovarian end; 3, cavity of body of uterus; 4, cavity of left horn; 5, right horn, with 4’, its com- 
munication with the body; 6, portio vaginalis uteri; 6’, external orifice of uterus; 7, broad ligament of uterus; 8, liga- 
ment of ovary; 9, vagina; 10, vulva; 10’, orifices of ducts of glandule vestibulares majores; 10’, orifices of ducts of 
glandule vestibulares minores; 11, transverse fold; 12, external urethral opening; 13, 13’, labia vulve; 14, glans 
elitoridis; 14’, junction of crura to form corpus clitoridis indicated by dotted lines; 15, urinary bladder; a, utero- 
ovarian artery with ovarian (a’) and uterine (a’’) branches; b, 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 em.) 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 with 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. | 
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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. 
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