Vessels and Nerves. The arteries of the penis are derived from 

 the internal pudic ; they are, the arteries of the bulb, arteries of the 

 corpus cavernosum, and dorsales penis. Its veins are superficial and 

 deep. The deep veins run by the side of the deep arteries, and ter- 

 minate in the internal pudic veins. The superficial veins escape in 

 considerable number from the base of the glans, and converge on the 

 dorsum penis, to form a large dorsal vein, which receives other veins 

 from the corpus cavernosum and spongiosum in its course, and passes 

 backwards between two layers of the ligamentum suspensorium, and 

 through the deep fascia beneath the arch of the os pubis, to terminate 

 in the prostatic and vesical plexuses. 



The Lymphatics terminate in the inguinal glands. The nerves are 

 derived from the internal pudic nerve, from the sacral plexus, and, as 

 shewn by Professor Miiller in his beautiful monograph, from the 

 hypogastric plexus. 



The urethra is the membranous canal extending from the neck of 

 the bladder to the meatus urinarius. It is curved in its course, and is 

 composed of two layers, a mucous coat and an elastic fibrous coat. 

 The mucous coat is thin and smooth ; it is continuous, internally, 

 with the mucous membrane of the bladder ; externally, with the in- 

 vesting membrane of the glans ; and at certain points of its extent, 

 with the lining membrane of the numerous ducts which open into the 

 urethra, namely, those of Cowper's glands, the prostate gland, vasa de- 

 ferentia, and vesiculae seminales. The elastic fibrous coat varies in 

 thickness in the different parts of the course of the urethra : it is thick 

 in the prostate gland, forms a firm investment for the membranous 

 portion of the canal, and is thin in the spongy portion, where it serves 

 as a bond of connexion between the mucous membrane and the corpus 

 spongiosum. The urethra is about nine inches in length, and is 

 divided into a prostatic, membranous, and spongy portion. 



The Prostatic portion, a little more than an inch in length, is 

 situated in the prostate gland, about one-third nearer its upper than 

 its lower surface, and extending from its base to its apex. Upon its 

 lower circumference or floor is a longitudinal fold of mucous membrane, 

 the vent montanum, or caput gallinaginis, and on each side of the veru, 

 a depressed fossa, the prostatic sinus, in which are seen the numerous 

 openings of the prostatic ducts. At the anterior extremity of the veru 

 montanum are the openings of the two ejaculatory ducts, and between 

 them a third opening, which leads backwards into a small csecal sac, 

 the sinus pocularis. The prostatic portion of the urethra, when dis- 

 tended, is the most dilated part of the canal ; but, excepting during the 

 passage of urine, is completely closed by means of a ring of muscular 

 tissue which encircles the urethra as far as the anterior extremity of 

 the veru montanum. In the contracted state of the urethra, the veru 

 montanum acts as a valve, being pressed upwards against the upper 



