SECT. 200.] VESSELS AND NERVES OF THE PF.NTS. 



445 



Fig. 182. 



arteries iu the trabecular is probably lost at the period of erection. 

 In the posterior part of the penis there are found numerous arterial 

 trunks, of 0'04'" to 008'" in diameter, peculiarly bent and con- 

 voluted ; they were discovered bv J. Midler, and are named arterice 

 h> licincB. They usually lie together in groups of from three to ten, 

 and do not end by crccal termination, as was at first supposed; but 

 they give off, I find, from their club-shaped ends, fine vessels, 

 o 006'" to 0"oi'" in diameter, which run further and terminate in 

 the sinuses, like the other twigs of the arteries. The corpus 

 spongiosum urethra? is supplied by the arterice bulbosce, bulbo- 

 urethrales, and dorsales, and the 

 distribution of the vessels in it is 

 exactly the same as has just been 

 described ; and helicine arteries also 

 occur in the bulb of the urethra. 

 The veins commence, if we may so 

 speak, by the anastomosing venous 

 spaces, from which the blood passes 

 into the outer veins provided with 

 special walls (the v. dorsalis, v. 

 profundi? and bulbosce especially), 

 through the intervention of short 

 efferent canals, which are numerous, 

 and arise in various ways from the 

 venous spaces. The lymphatics form very dense and fine networks 

 in the integument of the glans, in the prepuce, and in the rest of 

 the skin, and lead to the superficial inguinal glands by means of 

 trunks which accompany the dorsal vessels. According to Mas- 

 cagni, Fohmann, and Panizza, the interior of the glans around the 

 urethra also possesses numerous lymphatics, which run backwards 

 upon the urethra, and pass into the pelvic glands. The nerves of 

 the penis arise from the pudic nerve and the cavernous plexus of 

 the sympathetic ; the former of these chiefly supplies the skin and 

 the mucous membrane of the urethra. The cavernous bodies are 

 supplied from the pudic only to a slight extent, the sympathetic 

 nerve being specially distributed to these structures. The termi- 

 nations of the nerves in the skin and mucous membrane present 

 the same arrangement as usual in those tissues ; numerous divisions 

 especially, and slight indications of tactile corpuscles, are found in 

 the glans. The terminations of the nerves in the corpora cavernosa 

 are not yet known, though nerves with fine tubes and fibres of 

 Remak are easily demonstrable in the trabecular. 



A small artery of the corpus cavernosum 

 penis, of the man, injected, and magnified 

 30 times, giving off two arterire helicinae, 

 terminating in smaller vessels. 



