1394 



THE URINO GENITAL ORGANS 



in size and in some subjects is destitute of glandular tissue. The lower larger 

 portion sometimes presents a shallow median furrow which imperfectly separates 

 Aclosed by 'nfe* ctx\<] A lft lateral lobe ; these form the main mass of the gland and are 



which open directly into the cavernous spaces (,rig. 1143; 



ance, and form convoluted and somewhat dilated vessels, w, 



arteries (arteriae helicinae). They project into the spaces, 



capillary branches to supply the trabecular structure. The) 



fine fibrous processes, and are more abundant in the back pai 



CAVERNOUS 

 BRANCH 



DORSAL ARTERY 



CORPUS CAVERNOSUI 



INTERNAL PUDIC *" 

 ARTERY < 



._CORPUS 



FIG. 1145. Diagram of the arteries of the penis. (Testut.lkCAVERNOSUM 



The blood from the cavernous spaces is returned by a series of vessels, 

 in considerable numbers from the base of the glans penis and converge 

 organ to form the deep dorsal vein; others pass out on the upper surface of 

 and join the dorsal vein; some emerge from the under surface of thi 

 and, receiving branches from the corpus spongiosum, wind around the side 

 minate in the dorsal vein; but the greater number pass out at the root of tl 

 prostatic plexus. 



The fibrous envelope of the corpus spongiosum is thinner, whiter in cok 

 than that of the corpora cavernosa. The trabeculse are more delicate, more 

 size, and the meshes between them smaller than in the corpora cavernosa, tL 

 for the most part, corresponding with that of the penis. The external envelof lat ' ons f peritoneum 



r uch. (.Corning.) 



the corpus spongiosum 



SUPERFICIAL DOR- 

 SAL VEIN 



*>EEP DORSAL VEIN 



of unstriped muscle tis. 

 of the same tissue imme< 

 the canal of the urethr; 



VAS 



DEFERENS 



spongiosum receive^ 

 bulbourethral braa 



FIG. 1 149. Prostate with seminal vesicles and seminal ducts, viewed from in front and above. (Spalteholz.) 



