72 



HEALTH AND DISEASE 



to admit the point of the index-finger. This fact must be borne in mind 

 when passing the catheter, lest the instrument becomes lodged in one of 

 them. To guard against it the point should be well pressed down on to 

 the floor of the canal by the fingers acting through the perineum. 



A little behind the ejaculatory ducts are two rows of small openings 

 from the prostate gland, and beyond these occur others similarly arranged 

 proceeding from Cowper's glands. 



MUSCLES OF THE URETHRA 



The Accelerator Urinse (E, fig. 227). This muscle extends nearly 

 the whole length of the spongy portion of the urethra, commencing at the 



Fig. 227. Suspensory Ligament of Penis 



A, Erector Penis. B, Suspensory Ligament of Penis, c, Retractor Penis. D, Corpus Cavernosum. 

 E, Accelerator U rinse. P, Cremaster Muscle. G, Scrotum. H, Prepuce or Sheath. I, Glans Penis. 



ischiatic arch and continuing as far forward as the glans penis. It is com- 

 posed of a thin layer of fibres arranged around the corpus spongiosum, 

 which it almost completely invests. When it contracts, the walls of the 

 urethra are brought together and its contents are expelled. 



The action of this muscle is specially designed to expel the last small 

 portion of urine which remains in the canal after the bladder has emptied 

 itself. It also assists in ejecting the semen from the urethra in the act of 

 copulation. 



