270 



THE yiSCERA. 



dorsad of the origin of the ischiocavernosus, and passes mediad 

 to join the sphincter ani internus (c). 



M. caudoanalis (S.-D.) (Fig. 113, /; Fig. 114, ^).— A 

 slender, flat binidle of fibres having origin on the middle h'ne of 

 the ventral surface of the second and third caudal vertebrae. 

 It passes caudoventrad, lying between the levator ani and the 



Fig. 113. — Muscles of the Anus, Urogenital Organs, and Tail in the 



Male (Slightly Schematic). 



One side of the pelvis has been removed, a, a', M. extensor caudaj lateralis; b, 

 M. abductor caiida; externus; c, c' , M. flexor cauda; longus; </, M. flexor caudie 

 brevis; e, M. caudorectalis; /, M. caudoanalis; g, M. caudocavernosus; h, M. 

 sphincter ani internus; /, M. sphincter ani externus; 7, M. levator scroti; k, M. recto- 

 cavernosus; /, M. bulbocavernosus; in, M. ischiocavernosus (cut); «, M. compressor 

 urethrx menibranacea;. I, tail; 2, rectum; 3, bulbourethral or Cowper's gland; 4, 

 prostate gland; 5, symphysis pubis; 6, penis; 7, glans penis; 8, testis; 9, spermatic 

 cord. 



caudorectal (Fig. 113, e\ Fig. 114, /), and unites with the 

 ventral portion of the sphincter ani internus (Fig. 113, Jl). 



Action. — Draws the anus craniodorsad. 



M. caudorectalis (Fig. 113, e\ Fig. 114,7). 



Origin from the ventral surface of the sixth and seventh 

 caudal vertebrae. A small, at first unpaired band two or three 

 millimeters wide is formed, which passes cranioventrad, soon 



