270 



THE VISCERA. 



dorsad of the origin of the ischiocavernosus, and passes mediad 

 to join the sphincter ani internus (/:). 



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

 slender, flat bundle of fibres having origin on the middle line 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 caudse lateralis; t>, 

 M. abductor caudae externus; c, c', M. flexor caudae longusr d, M. flexor caudre 

 brevis; e, M. caudorectalis; f, M. caudoanalis; g. M. caudocavernosus; k, M. 

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

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

 urethrse membranacese. 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, //). 



Action. Draws the anus craniodorsad. 



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



Origin from the ventral surface of the sixth and seventh 

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

 millimeters wide is formed, which passes cranioventrad, soon 



