THE SEXUAL ORGANS. 633 



a. profundce penis alone run near the septum, surrounded by a sheath 

 of connective tissue continuous with the trabecular network, in fact 

 directly forwards, but giving off a small twig to the bulbs of the crura. 

 In this course they afford numerous, occasionally anastomosing branches 

 to the spongy substance, which, running in a convoluted manner (except 

 at the time of erection) in the axis of the traleculce, ramify in them, and 

 ultimately, without the formation of capillary plexuses open into the 

 venous spaces, by capillaries of 0-006-0*01 of a line in diameter. In 

 the posterior part of the penis there are numerous minute arterial 

 trunks, measuring 0-040*08 of a line in diameter, and for the most 

 part lying from 3-10 together, as was first observed by J. Muller ; they 

 are contorted and convoluted in a peculiar, tendril-like manner (arterice 

 helicince), and do not terminate in csecal ends, but, as I have ascertained, 

 give off from their clavate extremities minute vessels of 0-006-0-01 of a 

 line, which, like the other arterial prolongations, are continued further, and 

 terminate in the venous spaces. The arterial ramification is precisely 



Fig. 262. 



similar, in the corpus cavernosum urethrce, which is furnished with its 

 supply from art. bulbosce, bulbo-urethrales, and dorsales, and in the bulb 

 there also exist art. lielicince. The veins commence, as it may be said, 

 in the venous spaces which intercommunicate throughout ; and from 

 which, though not universally from the same situations, short efferent 

 canals, or emissaria, receive the blood and convey it into the external 

 veins, furnished with special walls (vena dorsalis, v. v. profundse, and 

 lullosce in particular). The lymphatics form very close and delicate 

 plexuses in the skin of the glans, the prepuce, and in the remainder of 



FIG. 262. Arteries from the corpora cavernosa penis of Man, injected ; magnified 30 diame- 

 ters. 1, one of the smaller arteries, with a lateral branch, dividing into two helicine arteries, 

 from the extremities of which two very small vessels proceed, and are continued into the 

 delicate trabecula ; 2, five helicine arteries placed on a short stem of a larger arterial divi- 

 sion; from two of these, fine vessels are seen to be given oft", the others appear to terminate 

 in caeca! ends : a, trabecular tissue, here presenting the form of sheaths to the arterial trunks 

 and helicine arteries ; 6, wall of the arteries. 



