MALE ACCESSORY REPRODUCTIVE ORGANS 243 



The penis is very sensitive to external stimulation, its 

 surface being beset with simple and compound end-bulbs 

 and Pacinian corpuscles, especially in the region of the glans. 

 Its innervation is described below. 



The arteries of the penis are the internal pudic arteries 

 and the dorsal artery. Some of the arterial branches project 

 into the intertrabecular spaces of the corpora cavernosa, and 



Corp. 



Spong. 



U. A. 



FIG. 58. Transverse section through adult human penis, x 3. (After 



Eberth, from Nagel.) 



A., artery; C., cntis ; Com., communication between the two corpora 

 cavernosa ; Corp. Spong., corpus spongiosum ; F., fascia ; N., nerves ; 

 .S'., septum; T. A., tunica albuginea ; Te. Subc., tela subcutanea penis; 

 Te. Subf., tela subfascialis ; Tun., tunica dartos penis; Tr., trabeculae 

 of corpus cavernosum ; U., urethra ; F., veins. 



form coiled dilated vessels which are known as the helicine 

 arteries. In most cases the arteries are said to open into the 

 venous spaces, through the intervention of capillaries, but a 

 .few of the smaller arteries are stated to communicate directly 

 with the cavernous veins. The blood is carried away by two 

 sets of veins, the one set uniting to form the dorsal vein, and 

 the other communicating with the prostatic plexus and the 

 pudendal veins. 



