292 NORMAL HISTOLOGY AND ORGANOGRAPHY. 



attached. It is devoid of fat and hair and darker in 

 color than the skin generally. Over the glans it is 

 redoubled in a loose fold, the prepuce or foreskin. 

 The inner layer of this fold is attached firmly to the 

 base of the glans or cervix, and from there it becomes 

 closely adherent to the glans as far as the orifice of 

 the urethra, where it meets the mucous membrane 

 of the latter. Over the glans it is red, thin, and 

 moist, and beset with numerous large vesicular and 



Corpora caver nosa. 



Prepuce. 



Dorsal artery. Corpora cavernosa. 



Corpus 

 spongiosum 



Urethra. 



Fig. 214. Cross section of penis: a, through the glans; 6, through the body. 



nerve papillae, but devoid of glands, excepting 

 around the cervix, where large sebaceous glands are 

 numerous, called glands of Tyson, which secrete a 

 white, waxy, odoriferous substance, the smegma. 



The corpora cavernosa are two parallel cylindrical 

 masses of erectile tissue that lie in the dorsum of the 

 penis. They blend together in the anterior portion, 

 and toward the root of the penis diverge to become 

 firmly attached to the pubic and ischial rami. The 

 anterior extremity of the corpora cavernosa is cov- 

 ered by the glans penis. 



Structure of Corpora Cavernosa. There is a median 



