272 THE VISCERA. 
circular course, and the cranial ones are attached to the crura 
of the penis. The other fibres have no fixed attachment. 
c. Muscles Peculiar to the Female (Fig. 114).—M. levator 
vulvz (Strauss-Durckheim), or constrictor cunni (6).—This is 
homologous with the levator scroti of the male. It consists of 
a band of fibres which pass ventrad from the external sphincter 
ani (a) and surround the vulva (3), lying immediately beneath 
the integument. 
M. constrictor vestibuli, or rectovaginalis (Strauss-Durck- 
heim) (@). 
Fic. 114..-MUSCLES OF THE ANUS AND UROGENITAL ORGANS IN THE FEMALE. 
a, M. sphincter ani externus; 4, M. levator vulvee; ¢, M. sphincter ani internus; 
ad, M. constrictor vestibuli; ¢, M. ischiocavernosus (cut); 7, M. urethralis; g, M. 
caudoanalis; 2, M. caudovaginalis; z, M. transversus perinei; 7, M. caudorectalis. 
I, the tail; 2, anus; 3, vulva; 4, rectum; 5, vagina; 6, neck of the bladder. 
Origin from the sides of the sphincter aniinternus (c). The 
muscle forms a distinct bundle two or three millimeters wide, 
which passes ventrocaudad and is zzserted into the ventral sur- 
face of the urogenital sinus, caudad of the insertion of the 
ischiocavernosus (@). 
M. caudovaginalis (Strauss-Durckheim) (#).—A slender 
band just craniad of the caudoanalis (g), and corresponding to 
the caudocavernosus of the male. 
Origin from the median line of the ventral surface of the 
first two caudal vertebre. The muscle passes caudoventrad, 
lying between the levator ani and the caudorectal (7), and is 
inserted into the ventral side of the urogenital sinus, at the base 
of the clitoris. 
