PENIS. ' 119 



which do not terminate, however, in these cells, but in blind tufts, 

 called helicine arteries. The two cylinders are partially separated 

 from each other by the septuirv pecti7iiforme, a partition which 

 is more complete behind than belbre, and whose fibres being ver- 

 tical, somewhat resemble the teeth of a comb, whence the name. 



The corpus spongioswn^^ occupies the same position with rela- 

 tion to the corpus cavernosum, as a ramrod does to a double-bar- 

 relled gun ; being a longitudinal groove on its inferior surface, the 

 nutritious vessels occupying a corresponding position above. It is 

 covered by a dense fibrous covering also, but it is thinner than that 

 of the corpus spongiosum. Internally it is composed of cells, which 

 are larger than those of the corpus cavernosum. 



Posteriorly it touches the triangular ligament ; this extremity is 

 enlarged into what is called the hulh^^ which lies between the diver- 

 gent crura of the penis; anteriorly it forms the glans penis.^^ 



The urethra is the urinary canal or tube from the bladder, and 

 perforates the corpus spongiosum. It consists of two coats ; the exter- 

 nal is formed of yellow elastic tissue, and often called muscular ; the 

 internal is mucous, and continuous with that of the bladder. Its 

 course is curved and its diameter varies. The first part perforates 

 the middle of the prostate gland, and is termed the 'prostatic por- 

 tion ,-® this is an inch in length, and in it we find the uvula vesica 

 behind and looking into the bladder ; and a triangular elevation of 

 mucous membrane in front, called the caput gallinaginis or veru- 

 'niontanum^ at the base of which are the orifices or orifice of the 

 ejaculatory duct. The next portion is the rnembra7ious /^" this is 

 eight or ten lines in length, and is very narrow ; it is surrounded by 

 loose tissue, and a few muscular fibres called the muscle of Guthrie 

 and Wilson. It perforates the triangular ligament. The urethra 

 now perforates the corpus spongiosum, not directly at its pendulous 

 tip, but through its superior convexity just in advance of this extre- 

 mity — there the urethra is of course called bulbous ;^ this portion 

 is the longest, and commences with an enlargement ; gradually it 

 diminishes in diameter until it reaches the glans, in which it again 

 enlarges and constitutes ihe fossa 7iavicularis.^ When the urethra 

 is relaxed, longitudinal folds exist in this portion. Numerous mu- 

 cous follicles are also readily seen, of which the largest is in the 

 fossa. The orifices of Cowper's glands open obliquely upon the 

 mucous membrane also, about an inch in front of the glands. 



The penis is supplied by the internal pudic arteries and pudendal 

 nerves. 



VESICULJE SEMINALES. 



The seminal vesicles consist of two convoluted tubes placed at 

 the posterior and inferior portion of the bladder. They are oblong 

 in shape, and converge downwards and forwards. Each appears 

 to be about two inches in length, but when cleanly dissected and 



