634 SPECIAL HISTOLOGY. 



the integument, and communicate with the superficial inguinal glands 

 through trunks accompanying the dorsal vessels. According to Mas- 

 cagni, Fohmann, and Panizza, there are also numerous lymphatics in the 

 glans surrounding the urethra, which run backwards on that canal, and 

 proceed to the pelvic glands. 



The nerves of the Joe«.^'s are derived from the pudendal and the plexus 

 cavernosus of the si/mpatketic, the former of which are distributed 

 principally to the skin and the mucous membrane of the urethra, and, 

 in a small proportion only, to the corpora cavernosa, to which alone the 

 latter set of nerves is destined. The terminations of the former nerves 

 present the same conditions as those of the integuments ; numerous 

 divisions, in particular, and faint indications of axile corpuscles, occur in 

 the glans penis ; those of the latter nerves are not as yet known, 

 although, in the traheculce of the corpora cavernosa, nerves with fine 

 fibres, and "fibres of Remak," are readily demonstrated. 



The smooth muscles of the corpora cavernosa are very distinctly 

 shown in i\\e penis of the Horse and Elephant, but are also not want- 

 ing in those of other Mammalia. The art. helicino', since Valentin and 

 Henle have declared them to be produced artificially, and to arise from 

 the inrolling of traheculce which have been cut across, or from the spon- 

 taneous retraction of certain arteries in stretched traheculce, have been 

 generally rejected,' but incorrectly. They do exist ; only I am satisfied 

 that the circumstance, noticed even by J. Muller, of the extremity of 

 one of these arteries, giving off an excessively delicate, almost capillary 

 vessel, occurs very frequently, and consequently, that the crecal termi- 

 nations are merely apparently such. That similar terminations do not 

 exist at all, cannot however, be definitively proved, and it is very pos- 

 sible that Mliller, in this respect also, may still be right. The art. 

 helicinw, therefore, are not simple vascular loops, as which they are 

 described by Arnold, although, in one instance, I have noticed such an 

 arrangement in place of them. 



§ 202. Physiological remarks. — The development of the testes, com- 

 mencing in the second month, takes place, according to all that we 

 know, from a hlastema which appears independently on the inner side 

 of the Wolffian body ; and, at first, the form of the male sexual glands 

 entirely resembles that of the ovaries. At a subsequent period, when 

 the Wolffian body begins to waste, a portion of its fine canals, the 

 Malpighian corpuscles of which disappear, become connected with the 

 testes, and are formed into the epididymis, whilst at the same time the 

 excretory duct of the Wolffian body constitutes the vas deferens.* Then, 



* [It is a curious fact connected with this alley;ed origin of tlie epididymis distinctly from 

 the rest of the gland, that, iu cystic disease of the testicle, eitlier of the innocent or tnalig- 



