512 



GENITAL ORGANS OF THE MARE 



are pressed up against the sublumbar muscles by the intestine (left portions of 

 large colon, small colon, and small intestine). They are cylindrical, and are 

 about ten inches (ca. 25 cm.) in length. The anterior extremity of each forms a 

 blunt point which receives the Fallopian tube. Posteriorly they increase some- 

 what in caliber, converge, and unite with the body. The dorsal (or attached) 

 border is slightly concave and is attached to the broad ligament. The ventral 

 border is convex and free. 



Fig. 410. — Genital Organ-s of Mare, Dorsal View. 

 The left cornu and adjacent part of the body of the uterus and the vagina and vulva are opened up. /, 

 Ovary; 2, Fallopian tube, with 2' , it.s fimbriated end; S, cavity of corpus uteri; >^, cavity of left cornu: 5, right 

 cornu, with 5', its communication with the body; 6, portio vaginalis uteri; 6', os uteri; 7, broad ligament of uterus; 

 8, ligament of ovary; 9, vagina; 70, vulva; 70', glandute vestibulares majores; 10" , glandulre vestibulares minores; 

 11, transverse fold; 12, external urethral opening; IS, IS' , labia vulva?; 14, glans clitoridis; 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, uterine artery. (After EUenberger, in Leisering's Atlas.) 



When a soft uterus is distended, the cornua are strongly curved, but this does not represent 

 the natural form. When fixed iu situ the horns are either .sHghtly ciu'ved or nearly straight. 

 The two horns are commonly unsynunetrical in length and diameter in mares which have borne 

 young. 



The body of the uterus (Corpus uteri) is situated jiartly in the alidomen, 

 partly in the pelvic cavity. It is cylindrical, but considerably flattened dorso- 

 ventrally, so that in cross-section it is elliptical. Its average length is about six 

 inches (15 cm.), and its diameter, when moderately distended, about four inches 

 (10 cm.). Its dorsal surface (Facies rectalis) is related to the small colon and rec- 



