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, f/; 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 vertebre. 
It passes caudoventrad, lying between the levator ani and the 
Fic. 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 caudz lateralis; 4, 
M. abductor caudz externus; ¢, c’, M. flexor caudz longus; d, M. flexor caudz 
brevis; ¢, M. caudorectalis; 7, M. caudoanalis; g, M. caudocavernosus; 4, M. 
sphincter ani internus; z, M. sphincter ani externus; 7, M. levator scroti; 4, M. recto- 
cavernosus; 7, M. bulbocavernosus; m, M. ischiocavernosus (cut); 7, M. compressor 
urethra membranacee. 1, 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, ¢; Fig. 114, 7), and unites with the 
ventral portion of the sphincter ani internus (Fig. 113, /). 
Action.—Draws the anus craniodorsad. 
M. caudorectalis (Fig. 113, ¢; Fig, 114, 7). 
Origin from the ventral surface of the sixth and seventh 
caudal vertebrze. A small, at first unpaired band two or three 
millimeters wide is formed, which passes cranioventrad, soon 
