VISCERAL ANATOMY. 149 



PENIS. 



The penis is the organ of copulation, attached behind to the 

 ischium and extending forward between the thighs, under the ab- 

 domen, where it ends in a free extremity, the glans, the anterior 

 termination of the spongy body. 



It consists of three portions, the two corpora cavernosa, between 

 and below which is the urethra, enclosed in its spongy tissue. 

 The free portion is lodged in the sheath or prepuce. 



Urethra, see above. 

 Corpora Cavernosa. 



Are divided only posteriorly where they are attached to the 

 ischial rami, but are blended in front, ending by entering depres- 

 sions in the glans. Underneath is the groove which lodges the 

 urethra. 



Structure. 



An external thick fibrous coat, giving off a median prolongation, 

 the septum pectini/orme, which separates the two portions. 



The interior is composed of cavernous or erectile tissue like the 

 spongiosum. At its base are found bouquet-shaped arterial tufts, 

 called arterice hellicince. 



The free portion of the penis has an enlarged base, and an an- 

 terior extremity, the glans, which is rounded and limited behind 

 by a marked elevation, the corona glandis. It receives behind 

 the insertion of the corpus cavernosum. Below this the urethral 

 tube, encircled by the urethral fossa; under this a marked notch. 

 The glans is covered by a dark smooth skin, with many papillae. 



Suspensory ligaments of penis (2). 



Arise beneath sacrum, pass downward, encircling rectum, and 

 inserted into the accelerator. 



Prepuce or sheath. 



A fold of the abdominal integument encircling the penis. It 

 contains internally a number of sebaceous glands. It has in its 

 structure two fibrous bands, the suspensory ligaments of the 

 prepuce. 



Blood Supply. Bulbo-urethral, dorsal arteries and of corpora 

 cavernosa. 



Nerves. Internal pudic and sympathetic. 



