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 

 vulvae (Strauss-Durckheim), or constrictor cunni (b], 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) (d). 



FIG. 114. MUSCLES OF THE ANUS AND UROGENITAL ORGANS IN THE FEMALE. 

 a, M. sphincter ani externus; b, M. levator vulvse; c, M. sphincter ani internus; 

 </, M. constrictor vestibuli; e, M. ischiocavernosus (cut); /", M. urethralis; g, M. 

 caudoanalis; h, M. caudovaginalis; i, M. transversus perinei; j, 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 ani internus (c). The 

 muscle forms a distinct bundle two or three millimeters wide, 

 which passes ventrocaudad and is inserted into the ventral sur- 

 face of the urogenital sinus, caudad of the insertion of the 

 ischiocavernosus (e). 



M. caudovaginalis (Strauss-Durckheim) (//). A slender 

 band just craniad of the caudoanalis (^), and corresponding to 

 the caudocavernosus of the male. 



Origin from the median line of the ventral surface of the 

 first two caudal vertebrae. The muscle passes caudoventrad, 

 lying between the levator ani and the caudorectal (/), and is 

 inserted into the ventral side of the urogenital sinus, at the base 

 of the clitoris. 



