1966 



HUMAN ANATOMY. 



Fig 



Distal end 

 of corpus- 

 cavernosuni 



by the urethra, and is marked by a median raphe, which is continuous with that of 

 the scrotum and, as the latter, indicates the line of fusion of the original components 

 of the spongy body. 



The conical glans, which forms the distal end of the organ, is limited along its 

 oblique base by a prominent rounded border, the corona glandis, that runs downward 

 and forward from the dorsum towards the under surface and marks a groove (sulcus 

 retroglandularis) that separates the glans from the body of the penis. The constricted 

 zone immediately behind the glans constitutes the fteck (collum penis). In conse- 

 quence of the obliquity of the corona, the 

 dorsal expansion of the glans measures 

 about twice the length of its under sur- 

 face. 



The skin covering the pendulous 

 portion of the penis — very thin, delicate, 

 and elastic, and possessing only fine 

 hair (lanugo) except in the immediate 

 vicinity of the pubes — is loosely attached 

 over the body of the organ by subcu- 

 taneous tissue, devoid of fat, that permits 

 of ready movement of the integument. 

 Along the under surface of the organ 

 bundles of involuntary muscle closely 

 adhere to the integument and constitute 

 a stratum, the hinica dartos penis, that 

 Corpus cavernosum resembles the similar layer of the scro- 

 tum. Just behind the corona the skin 

 "" forms a free duplicature, ih^ prepuce or 



foreskin ( praeputium penis), that covers 

 the glans to a variable extent (in children 

 and in some adults completely) and is 

 firmly attached by its inner layer to 

 the neck of the penis along a line about 

 3 mm. above the corona. From this 

 point the skin is prolonged over the 

 glans, to which it is intimately applied, 

 as far as the meatus, where the integu- 

 ment becomes continuous with the ure- 

 thral mucous membrane. The lines of 

 reflection of the prepuce on the two sides 

 converge and finally meet along the 

 under surface of the glans in a sharp 

 median fold, xh&frenum (frenulum prae- 

 putii), that extends as far as the pos- 

 terior border of the slit-like urethral 

 opening. On either side of this fold a 

 shallow recess (fossa frenuli) extends the 

 preputial sac. The skin lining the latter 

 and covering the glans is modified so 

 that it somewhat resembles a mucous membrane, as which it is often inaccurately 

 described. While entirely devoid of hairs, small sebaceous glands are sparingly 

 distributed over the glans, corona, and inner layer of the prepuce. These, formerly 

 supposed to be of large size and named \\\^ glands of Tyson (glandulae praeputiales), 

 secrete unctuous material which, mixed with discarded epithelial cells, may collect 

 in the groove behind the corona as a cheesy substance, the smegma. 



The corpora cavernosa (corpora cavernosa penis) are two cylinders of erectile 

 tissue, when relaxed about 15 cm. (6 in.) in length, that form the chief bulk of the 

 body of the penis. Each is enclosed within a dense fibro-elastic envelope, or tunica 

 albnginea, which internally is continuous with the trabeculae between the blood- 

 spaces. Beginning above at the root of the penis as the diverging pointed and then 



Cms 



Bulbus 

 urethrsE 



Urethra, cut 



Inferior layt 

 of triangular X—-' 

 ligament 

 Attachment of bulb, cut 



Dissection of penis, showing three component cylin- 

 ders of erectile tissue ; distal end of corpus spongiosum, 

 with glans, has been freed and turned aside ; attachment 

 of urethral bulb has been cut and bulb drawn aside. 



