248 SPECIAL ANATOMY. 



pass very much convolved into their plexus cavernosus, and still even present 

 enlargements, sinus venosi, although unusually large. A portion of the arteries 

 (Artt. helicina Mutter}, which contribute towards erection, are said to open di- 

 rectly into these sinuses. 



b. Corpus cavernosum urethra, the spongy body of the urethra, which it sur- 

 rounds like a sheath, and extends from the symphysis, where it is surrounded 

 by m. bulbo-cavernosus, and swells out like a bulb (bulbus cavernosus) [spon- 

 giosum], to the inferior surface of the penis, as far as the glans, without com- 

 municating with the corpus cavernosum penis, but with the glans. Its struc- 

 ture is just the same as the last, only the septum is wanting. 



c. The nut, glans penis, gaXavoc, the anterior blunted, conical extremity of 

 the member, is perforated by the urethra, the elongated opening of which it 

 presents at its apex. The excavated basis of the glans projects over the carp, 

 cavern, penis, which lie% within it, so that an enlarged border, distinctly beset 

 with nervous papillae, corona glandis, appears. The superior convex surface 

 is smooth, the inferior flat surface smaller, and divided by a longitudinal sulcus 

 into two tubercles, between which, as far inwards as the corona, the cord 

 (frenulum prceputii] is attached, which is a fold of the prepuce. The paren- 

 chyma of the glans is of the same character as that of the spongy body, only 

 more closely compressed. It is connected with the corp. cavernos. urethra. 



d. The external coverings of the penis. 



1. Fascia penis, a continuation of /. perinai, forms the lig. pubo-prostaticum, 

 which extends from the roots of the corp. cavern. penis to the lig. arcuatum, and 

 is perforated by the urethra ; covers upon the dorsum of the penis the Vasa 

 dorsalia, and reaches as far as the glans. 



2. The external skin, attached by loose uniting tissue, destitute of fat, to the 

 fascia, is very thin, brownish, hairless, and moveable, and by these circum- 

 stances is distinguished from the skin above and behind the root of the penis, 

 on the pubes, mons veneris. Behind the corona glandis the skin, instead of 

 passing over directly upon it, leaves the glans, passes away as far as over the 

 orifice of the urethra, is then reflected, and goes as far back as the posterior 

 border of the glans; very delicate, vascular, and firmly attached to the last 

 and to the mucous membrane of the urethra. Thus the foreskin (praputium) 

 arises, a free sheath, consisting of two layers, the internal of which is attached 

 as frenulum praputii to the inferior surface of the glans, and behind corona 

 glandis is beset with numerous sebaceous glands, glandula praputiaks s. odori- 

 ferce Tysoniana, and secretes the smegma praputii. The opening of the pre- 

 puce is frequently too much contracted, the frenulum too long, as it reaches as 

 far as the orifice of the urethra. 



3. Lig. suspensorium penis, a triangular, yellow, elastic Imnd in the central 

 line between Symphisis pubis and corp. cavernosum penis, serving to fasten it, is 

 a continuation of the decussation of lig. Pouparti. It does not possess mus- 

 cular fibres (m. pubo-cavernosus, sometimes; it is a portion of bulbo-cavernosus) . 



The vessels of the Penis : Arter. profunda penis goes partly into the veins, 

 partly into the blindly terminating (Miiller) or looped Art. helidna projecting 

 into the sinus of the veins; art. dorsalis penis. Veins: dorsalis penis (forms a 

 sinus), only one, between two arteries. 



Nerves: .ZV. pudendus communis; plexus cavernosus N. sympathici, most of the 

 branches to the glans. After division of the n. dorsalis penis, the corp. caver- 

 nosa collapse, become more vascular, but incapable of erection. 



