MALE ORGANS OF GENERATION 221 



of the urethra, the meatus urinarius; passing from the lower 

 margin of this is a fold of mucous membrane continuous with 

 the prepuce and called the frenum prtzputii. At the base of 

 the glans is a projecting edge or corona, and behind that a 

 constriction, the cervix. Sebaceous glands (of Tyson) are 

 found on both. The integument of the penis, attached to 

 the neck of the glans, is doubled upon itself, forming the 

 prepuce or foreskin. 



The body is the part between the root and the glans, the 

 upper surface being the dor sum. 



The corpora cavernosa form the greater part of the body 

 of the penis; they are two cylindrical columns placed side 

 by side, connected together for the anterior f ths, the septum 

 pectiniforme intervening, but separated behind to form the 

 two crura, which are attached to the inner margins of the 

 ischial and pubic rami ; anteriorly the corpora cavernosa fit 

 into the base of the glans. There is a groove on the upper 

 surface for the dorsal vein of the penis and another groove 

 on the lower surface for the corpus spongiosum ; the corpora 

 are attached to the pubic symphysis by the suspensory liga- 

 ment. 



The corpus spongiosum commences at the triangular liga- 

 ment by an enlargement, the bulb, and runs forward in the 

 groove on the under surface of the corpora cavernosa, ex- 

 panding over their extremities to form the glans. The bulb 

 lies below the anterior or lower layer of the triangular 

 ligament, and is embraced by the accelerator urinae muscle. 

 The urethra pierces the bulb near its upper surface, and then 

 runs forward in the middle of the corpus spongiosum. 



The URETHRA in the male extends from the neck of the 

 bladder to the end of the penis, and has a length of from 6 to 

 8 inches. It is divided into three parts, according to the 

 structures through which it passes. 



(1) The prostatic portion passes through the prostate gland 

 from base to apex ; this part is ij inches long and spindle- 

 shaped : in cross-section it is horseshoe-shaped, with the 

 convexity forwards. On the posterior wall is a longitudinal 

 ridge, the verumontanum or caput gallinaginis, and on each side 

 of this promontory is a depression, the prostatic sinus, into 

 which the prostatic ducts open. Towards the anterior part 

 of the verumontanum is a depression, the sinus pocularis, 

 vesicula prostatica, or utricle, upon the elevated edges of which 

 the ejaculatory ducts open. 



(2) The membranous portion extends from the apex of the 

 prostate to the bulb, and is inch long anteriorly, but only 



