MALE ORGANS OF GENERATION. 649 



The arteries of the bladder vary in their origin, number, 

 and size. They come from the internal iliac, pudic, and 

 obturator. 



The veins form around the cervix a plexus, which dis- 

 charges into the internal iliac vein or some of its branches. 



The nerves come from the hypogastric plexus, consisting 

 both of ganglionic and spinal filaments, which explains 

 the fact of the bladder being both a voluntary and in- 

 voluntary organ. 



Function. The use of the bladder is essentially that of a 

 reservoir for the urine ; and by its muscular apparatus it is 

 the chief agent of expelling the urine, as in paralysis of 

 the bladder no action of the abdominal muscles can effect 

 the expulsion. 



CHAPTER VI. 



THE ORGANS OF THE TRUNK. 



FIFTH DIVISION. 



ORGANS OF THE PELVIS. 



THIS division comprises the organs of the pelvis, including 

 the male and. female organs of generation. 



SECTION I. 

 THE MALE ORGANS OF GENERATION. 



These organs comprise the testes, and their appendages, 

 the vasa deferentia, the vesiculce seminales, the prostate 

 gland, and the penis. 



The testes are two oval glands, suspended rather obliquely 

 and having the sides compressed. The right is higher than 

 the left. Each is surrounded by several coats, the scrotum, 

 tunica vaginalis, tunica albuginea, and tunica vasculosa. 



The scrotum is a double membrane. The outer consists of 

 the common integument, and is distinguished by being very 

 thin, of a dark color, and so transparent that the subcu- 



