MALE EEPEODUCTIVE ORGANS 327 



contact with the anterior end of the testis : (2) a 

 narrow band, extending backwards from the caput 

 along the testis : and (3) a larger, more conical, 

 and much convoluted body, the Cauda epididymis, 

 lying at the posterior end of the testis, and con- 

 nected by a short cord, the gubernaculum, with 

 the bottom of the scrotal sac. 



The epididymes are the modified mesonephra 

 of the embryo, the tubules of which grow into the 

 testes, and so form the vasa efferentia, through 

 which the spermatozoa escape from the testes. 



d. The vas deferens is a whitish tube, which arises from 

 the Cauda epididymis and runs forwards, alongside 

 the testis, to enter the abdominal cavity through 

 the inguinal canal. Within the abdomen it loops 

 round the ureter from the outer to the umer side, 

 and runs back to the neck of the bladder. The 

 hinder part of its course is somewhat convoluted 

 and sinuous, but further forwards it becomes 

 straighter. 



The vasa; deferentia are the modified meso- 

 nephric ducts of the embryo. 



Dissect both scrotal sacs from the abdominal wall, and 

 turn them forwards with the testes and vasa deferentia. 

 Determine with the finger the boundaries of the pubes and 

 ischia. Cut longitudinally through the muscles ventral to the 

 pelvis, about half an inch from the middle line on each side, 

 and down to the bone. Scrape clean the descending rami of 

 the pubes and ischia, and cut through them with bone-forceps 

 in front of, and behind, the obturator foramen on each side. 

 Remove the pelvic symphysis, whichis now isolated; ca/refully 

 dissecting it from the underlying parts. Note the corpora 

 cavernosa, a pair of hard ligamentous bodies running back- 

 wards from the hinder border of the ischia to the penis ; and 

 cut them across close to the ischia. 



Inflate the bladder and urino-genital canal by a blowpipe 

 inserted into the terminal aperture of the penis, and tie a 



