MALE PERINEUM 177 



Cutaneous. Posterior scrotal. 



II. Nerve to the bulbo-cavernosus. 



2. Nerve to the ischio-cavernosus. 



3. Nerve to the transversus perinei superficialis. 



4. Nerve to the transversus perinei profundus. 



5. Nerve to the sphincter urethrse membranacere. 

 Nerves to the bulb of the urethra. 



It supplies also one or two branches to the bulb and the 

 corpus cavernosum urethrae. 



The dorsal nerve of the penis follows the pudendal artery 

 between the two fasciae of the urogenital diaphragm, where it 

 lies more completely under shelter of the side of the pubic 

 arch than the artery. Finally, piercing the inferior fascia of 

 the diaphragm, about half an inch below the symphysis 

 pubis, it accompanies the dorsal artery of the penis. At the 

 root of the penis it supplies one or two twigs to the corpus 

 cavernosum penis. 



Glandulse Bulbo-urethrales (O.T. Cowper's Glands). As a 

 general rule, the bulbo-urethral glands can readily be detected 

 by raising the posterior fibres of the deep transverse perineal 

 muscles. They are small lobulated bodies of a deep yellow 

 colour, and resemble peas, both in size and in shape. They 

 are placed, one on each side of the middle line, immediately 

 below the membranous part of the urethra, and are overlapped 

 by the posterior part of the bulb separated from it, however, 

 by the inferior fascia of the urogenital diaphragm. Each 

 gland has a very delicate and relatively long duct which is 

 difficult to find. The duct does not open into the mem- 

 branous part of the urethra, but passes forwards at the side 

 of the urethra, through the inferior fascia of the urogenital 

 diaphragm, to open into the floor of the penile part of the 

 urethra 25 mm. (one inch) beyond the diaphragm (Figs. 200 

 and 203). 



Pars Membranacea Urethrae (Membranous Portion of the 

 Urethra). The canal of the urethra is subdivided for descrip- 

 tive purposes into three parts, according to the structures 

 which are in relation to its walls, as it passes from the bladder 

 to its termination on the glans penis. These are (i) the 

 prostatic portion; (2) the membranous portion; and (3) the 

 cavernous portion. Each of the subdivisions has a very 

 definite relation to the urogenital diaphragm; the prostatic 

 part is placed above and posterior to both fasciae of the 

 diaphragm ; the membranous part is situated between the 



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