iv THE GENERATIVE SYSTEM OF THE MALE 139 



surmounted at the extremity by the corpus spongiosum of the 

 glans (Figs. 30 and 31). 



The corpora cavernosa of the penis correspond to the dorsum 

 and sides of the penis itself. The erectile tissue is covered by 

 a dense fibrous membrane, extensile and elastic, and called the 

 tunica albuginea, which sends into the interior radiated pro- 

 longations. It is a spongy 

 vascular tissue, in which the 

 inter-communicating lacunae 

 consist of enormously dilated 

 venous spaces, intercalated be- 

 tween the extremities of the 

 arteries and the capillaries, 

 and the beginning of the veins 

 (Fig. 32). They are formed 

 by innumerable lamelliform 



Fir,. 30. Root and posterior part (pars perine- 

 alis) of the body of penis seen from 

 below, after removal of the integument and 

 muscles, ccp, ccp, corpora cavernosa of 

 penis ; br, bulb of root of corpus caver- 

 nosum ; r, extremity of root of corpus 

 cavernosnm ; ecu, corpus spongiosum ; 

 bu, bulb of urethra; p, skin of penis; 

 bi/i, ischiopubic arch ; in, urogenital 

 trigone ; ctp, tendinous centre of perineum. 



Fio. 31. The penis from below, after the 

 corpora cavernosa have been laid bare. 

 The corpus spongiosum has been cut in 

 front of the bulb, and this is turned aside. 

 In front the corpus spongiosum and the 

 glans are isolated and detached from the 

 corpora cavernosa of the penis, d, d, 

 ventral depression or conduit between 

 the two corpora cavernosa, which receives 

 the corpus spongiosum ; a, anterior ex- 

 tremity of the corpora cavernosa ; g, glans ; 

 eg, corona of glans. The other indications 

 as in preceding figure. 



or filamentous trabeculae, which circumscribe spaces of varied form 

 and size. The trabeculae consist for the most part of smooth 

 muscular fibres interwoven in a diversified way, mixed with a 

 network of connective tissue and elastic fibres. Their surface is 

 covered by an endothelial layer which lines the small spaces. 



The corpus spongiosum or corpus cavernosum of the urethra 

 is a median organ situated ventrally in respect to the corpora 



