124 ELEMENTS OF MAMMALIAN ANATOMY 



(222) Extensor caudae lateralis, sacral and caudal vertebra? 

 to dorsal surface of tail. Raises tail. 



(223) Extensor caudae medialis, sacral and first caudal 

 vertebra' to dorsal surface of tail; raises tail. 



(224) Sphincter ani externus with (225) Sphincter ani 

 internus form the constrictors of the anal pouch. 



(226) Ischiocavernosus, ramus of ischium to outer surface 

 of crus penis. In female the insertion is at base of clitoris. 



(227) Transversus perinei, medial surface of ischium to 

 join sphincter internus. 



(228) Caudorcetalis, ventral surface of sixth and seventh 

 caudal vertebrae to spread over sides of rectum. 



(229) Caudoanalis, ventral surface of second and third caudal 

 vertebrae to unite with sphincter ani internus; draws anus 

 craniodorsad. 



MUSCLES OF UROGENITAL SYSTEM PECULIAR 



TO MALE 



(230) Levator scroti, sphincter ani internus to scrotum. 



(231) Rectocavemosus {retractor penis) sphincter ani internus 

 to corpus cavernosum. 



(232) Caudocavemosus, first two caudal vertebrae to corpus 

 cavernosum. 



(233) Bulbocacemosus (accelerator nrince) 



(234) Compressor urethrae membranaceae. 



MUSCLES PECULIAR TO FEMALE 



(235) Levator vulvae {constrictor cunni) homologous with 

 levator scroti of male. 



(236) Constrictor vestibuli {rectovaginalis) sphincter internus 

 to urogenital sinus. 



(237) Caudovaginalis, first two caudal vertebrae to base of 

 clitoris. 



(238) Urethralis symphysis of ischium to sides of vagina 

 and urogenital sinus. 



