118 



PENIS. 



into the female. The anterior extremity or head is the glans^^'^ the 

 posterior extremity is the root^ and the intervening part is the hod.y^ 

 which consists of two structures, the corpus cavernosum and corpus 

 spongiosum. 



Fig. 101. 



The skin of the penis is thin and delicate, and has numerous 

 hairs and sebaceous follicles. Surrounding the glans is a loose 

 doubling called the prepuce^ which is connected to the orifice of the 

 urethra by a vertical process called ihefrcenum. 



The base of the glans has a thick rim or edge around its base, 

 the corona glandis, behind which the penis is narrow, and this por- 

 tion is known as the neck or collum. The glands of Tyson are 

 the sebaceous follicles, numerous about the neck and crown, and 

 whose secretion is called smegma. 



Beneath the skin is the fascia of the penis, which is formed of 

 condensed cellular tissue, and is in fact a continuation and modifi- 

 cation of the superficial fascia of the abdomen. That portion which 

 passes from the pubis to the penis is the ligamentuni suspensorium, 

 which is triangular in shape and vertical in position, and antero- 

 posterior in direction. The fascia of the penis may be said to be 

 formed, by the penis being included between two laminae of this 

 ligament. 



The corpus cavernosum forms the largest part of the penis, and 

 is in shape a double cylinder. At the root these cylinders are sepa- 

 rate and pointed, and called the crura^^ of the penis — each crus is 

 firmly attached to the ramus of the pubes and ischium, constituting 

 the origin of the penis. Externally the corpus cavernosum is co- 

 vered by a dense, thick, fibrous, and elastic coat. Internally it 

 consists of a spongy structure made up of cells, which readily com- 

 municate with the arteries and veins. There are some arteries 



