THE ABDOMINAL WALL 



247 



Dorsal 

 vein 

 / Dorsal nerve 



Corpus caver- 

 nosum urethras 



Urethra 



FIG. in. Transverse section through 

 the body of the Penis. 



the suspensory ligament, and enters the pelvis after passing 

 below the arcuate ligament of the pubis. It ends by joining 

 the pudendal plexus of veins. 



The dorsal arteries are terminal twigs of the internal 

 pudendal arteries. They pass forward between the two 

 layers of the suspensory ligament, and, continuing their 

 course, on the dorsum of the penis, they terminate in 

 branches to the glans penis. 



The dorsal nerves are 

 branches of the pudendal 

 nerve. They accompany 

 the arteries, and end in fine 

 twigs to the papillae of the 

 glans. 



Dissection. Make a 

 transverse section through 

 the corpora cavernosa of 

 the penis and urethra, but 

 leave the skin on the 

 inferior surface undivided 

 in order that the two 

 segments of the divided 

 organ may remain con- 

 nected until the urethra has been examined at a later stage. 

 After the section has been made examine the naked - eye 

 structure of the divided parts. 



Structure of the Corpus Cavernosum Penis. The corpus 

 cavernosum penis consists of a spongy tissue, called cavernous 

 tissue, surrounded by a dense white fibrous sheath called the 

 tunica albuginea of the corpus cavernosum, and it is divided 

 into right and left halves by a median fibrous septum, the 

 septum penis. The septum is incomplete; numerous vertical 

 clefts, which are not recognisable in the transverse section, 

 pass through it ; the clefts may, however, be seen if the 

 cavernous tissue is dissected away from the septum for a 

 short distance on one or the other side. The fibrous stroma 

 of the cavernous tissue is connected with the deep surface 

 of the tunica albuginea. In the centre of each half of the 

 divided corpus cavernosum penis the divided profunda artery 

 may be seen. 



Structure of the Corpus Cavernosum Urethrse. The 



corpus cavernosum urethrse also consists of cavernous tissue, 



but the meshes of the cavernous reticulum are finer than 



those of the corpus cavernosum penis. The fibrous sheath 



n16 c 



