B1CT. 201.] THE MALE SEXUAL ORGANS. 449 



cavemosus muscles, which are provided with transversely striped 

 fibres, increase the rigidity in the anterior parts by the compression 

 of the root of the penis with the dorsal veins ; but under no cir- 

 cumstances can these muscles, of themselves alone, contribute to 

 the bringing about of the erection. 



The investigation of the male sexual organs does not, in general, present 

 any great difficulties. The seminal tubules are extremely easy to isolate, and 

 when they are teased out with a little care, some of their divisions are always 

 met with. In order to see their course, they must be injected in the method 

 pointed out by J, author A. Cooper, which will be found quoted in all Handbooks 

 Anatomy. The vas deferens is best studied in transverse sections of pre- 

 parations which have been hardened or dried, and the same applies to the 

 glands of the prostate ; whilst, on the other hand, the muscular structure of 

 the prostate and of the corpora cavernosa can be distinctly made out only 

 when the parts are fresh, or after the employment of nitric acid. The arterise 

 helicinee are recognisable, even in fresh preparations, in the neighbourhood of 

 the large arterial trunks, and still better after injection with fine size. 



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 Leipzig, 1846. C. J. Lampferhoff, De Yesieulurum Seminalium Naturu et 

 Usu, Berol., 1835. Pittard, art. Yesiculee Seminales, in Todd's Cyclop., 

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