GENITAL ORGANS OF THE SOW 



611 



fibers between two layers of longitudinal fibers. The mucous membrane is plicated, 

 and is intimately united with the muscular coat. 



The vulva is about three inches (7.5 cm.) in length. The labia are thick and 

 are covered with a wrinkled integument. The dorsal commissure is rounded, but 

 the ventral one is produced to form a long pointed projection. The fossa clitoridis 

 is nearly an inch (ca. 2 cm.) anterior to the ventral commissure. Above it the 

 glans clitoridis forms a pointed projection, from which a mucous fold extends 

 laterally and backward on each side. There is a deep central depression about 

 half way between the fossa clitoridis and the external urethral orifice. The latter 

 is bounded on each side by a thick fold which extends backward for a variable 



Fig. 540.— Genital Organs of Sow; Dobsal View. The Vulva, Vagina, anb Cehvix Utehi abe Slit Open. 

 1, Labium vulvffi; S, glans clitoridis; 3, vulva; 4, external urethral orifice; B, vagina; B' , cervix uteri; 6, corpus 

 uteri; 7, cornua uteri, one of which is opened at 7' to show folds of mucous membrane; 8, uterine tube; 8', abdominal 

 opening of tube; 9,9, ovaries; 10, ovarian bursa; 11, 11, broad ligaments of uterus; 12, urinary bladder. (From 

 Leisering's Atlas.) 



distance. Lateral to this fold is a depression in which the ducts of vestibular glands 

 open. 



On either side of the anterior part of the floor of the vulva there is a cul-de-sao and a deep 

 groove leading back from it; these are bounded medially by a longitudmal fo d. Ductus epo- 

 ophori (canals of Gartner) may be found opening anterior to the external urethral orihce. 



The clitoris is long and flexuous; its glans forms a pointed projection over the 

 ■fz-iQciQ pli'f'oriQ.is. 



The urethra is about three inches (ca. 7-8 cm.) long. Its posterior part is fused 

 with the vagina and produces a corresponding elevation of the floor of the latter. 



The mammary glands are usually ten or twelve in number, and are arranged 

 in two rows, as in the bitch. Each teat has commonly two ducts. 



