Title: Anatomy, descriptive and applied
Identifier: anatomydescript00gray (find matches)
Year: 1913 (1910s)
Authors: Gray, Henry, 1825-1861; Spitzka, Edward Anthony, 1876-1922
Subjects: Anatomy
Publisher: Philadelphia, New York, Lea & Febiger
Contributing Library: Columbia University Libraries
Digitizing Sponsor: Open Knowledge Commons

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1390 THE URINOGENITAL ORGANS On entering the cavernous structure the arteries divide into branches which are supported and enclosed by the trabecule. Some of these terminate in a capillary network, the branches of which open directly into the cavernous spaces (Fig. 1160); others assume a tendril-like ajjpear- ance, and form convoluted and somewhat dilated vessels, which were named by Muller helicine arteries (arteriae helicinae). They project into the spaces, and from them are given off small capillary branches to supply the trabecular structure. They are bound down in the spaces by fine fibrous processes, and are more abundant in the back part of the corpora cavernosa.
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Fig. 1162.—Diagram of the arteries of the penis. (Testut.) The blood from the cavernous spaces is returned by a series of vessels, some of which emerge in considerable numbers from the base of the glans penis and converge on the dorsum of the organ to form the deep dorsal vein; others pass out on the upper surface of the corpora cavernosa and join the dorsal vein; some emerge from the under surface of the corpora cavernosa, and, receiving branches from the corpus spongiosum, wind around the sides of the penis to ter- minate in the dorsal vein; but the greater number pass out at the root of the penis and join the prostatic plexus. The fibrous envelope of the corpus spongiosum is thinner, whiter in color, and more elastic than that of the corpora cavernosa. The trabecule are more delicate, more nearly uniform in size, and the meshes between them smaller than in the corpora cavernosa, their long diameter, for the most part, corresponding with that of the penis. The external envelope or outer coat of the corpus spongiosum is formed partly of unstriped muscle tissue, and a layer of the same tissue immediately surrounds the canal of the urethra. The corpus spongiosum receives its blood through the bulbourethral branch of the internal pudic artery. The lymphatics of the skin of the penis terminate in the inguinal nodes. The lymphatics of the penile portion of the urethra accompany those of the glans penis and terminate with them in the deep inguinal and external iliac nodes. Those of the membranous and prostatic portions pass to the internal iliac nodes. The nerves are derived from the in- ternal pudic nerve and the pelvic plexus. On the glans and bulb some filaments of the cutaneous nerves have Pacinian bodies connected with them, and, according to Krause, many of them terminate in peculiar end-bulbs (see p. 817). Applied Anatomy.—It is occasionally necessary to remove a penis for malignant disease. Usually, removal of the antescrotal portion is all that is necessary, but sometimes it is requisite to remove the whole organ from its attachment to the rami of the ossa pubis and ischia. The former operation is performed either by cutting off the whole of the anterior part of the penis with one sweep of the knife, or, what is better, cutting through the corpora cavernosa from the dorsum, and (^hen separating the corpus spongiosum from them, dividing it at a level nearer the glans penis. The mucous membrane of the urethra is then slit up, and the edges of the flap attached to the external skin, in order to prevent contraction of the orifice, which would other-

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