162 THE CORPUS SPONGIOSUM URETHRA. 



cavernosa, it expands and forms a body of a particular figure 

 which covers the extremities of the corpora cavernosa, and is 

 denominated the Glans Penis. 



The Corpus Spongiosum begins at the distance of eight or 

 ten lines from the anterior part of the prostate. It is much 

 larger at its commencement than at any other part except the 

 glans, and this enlarged part is called the Bulb. It surrounds 

 the whole of the urethra, gnd, with the exception of the 

 bulb and the glans penis, is of a cylindrical figure. It is formed 

 by a membrane which has some resemblance to the coat of the 

 penis, but is much thinner, and by a peculiar spongy substance, 

 which occupies the space between the internal surface of this 

 membrane and the external surface of the canal of the urethra. 

 The membrane and the spongy substance, form a coat to the 

 urethra, which, with the exception of the enlargement before 

 mentioned, is about one line thick.- After this spongy substance 

 has arrived at the termination, its coat adheres firmly to the 

 coat of the penis. 



The Bulb, or first enlargement of the corpus spongiosum, is 

 oblong, and rather oval in form ; it is marked by a longitudinal 

 depression in the middle, which is very superficial. It consists 

 entirely of the spongy substance above mentioned. 



The Glans Penis is also composed of the same spongy sub- 

 stance, but the coat which covers it is more thin and delicate 

 lhan that of the other parts of the urethra. The lower surface 

 of the glans is fitted to the extremities of the corpora cavernosa, 

 but it is broader than the corpora cavernosa, and therefore pro- 

 jects over them on the upper and lateral parts of the surface 

 of the penis. The edge of the prominent part is regularly 

 rounded, and is denominated the Corona Glandis. 



The contracted portion immediately behind the corona, is 

 called the collum or neck. 



Several small arteries pass to this spongy structure. The 

 pudic artery, as it passes on each side to the corpora cavernosa, 

 sends a branch to the bulb of the urethra. The same vessel, 

 in the substance of the penis, also sends branches to the ure- 

 thra ; and the artery on the back of the penis terminates in small 

 branches, which penetrate the substance of the glans. 



