416 



which is 

 imperfect ; 



how 

 formed ; 



and nume- 

 rous bands 

 and cords to 

 form a net- 

 work. 



Vessels. 



Source of 

 the arteries ; 



CIS 



termination 

 in venous 

 spaces. 



Veins in 

 two sets. 



material of 

 the penis : 



its structure 

 like caver- 

 nous. 



The fibrous 



DISSECTION OF THE PELVIS. 



cavity into two ; but as it reaches forwards it becomes less strong, 

 and is pierced by elongated apertures, which give it the appearance 

 of a comb, from which its name, sepiitra pectiniforme, is derived. 

 Through the intervals in the septum the vessels in the corpora 

 cavernosa communicate. It is formed by the circular fibres of the 

 fibrous case. 



The cavernous or trabecular structure is a network of fine threads, 

 which fills the interior of the corpora cavernosa. Its processes are 

 thinner towards the centre than at the 

 circumference ; and the areolar spaces are 

 larger in the middle and at the fore part 

 of the contained cavity, than at the cir- 

 cumference or in the crura of the penis. 

 The spongy structure may be demonstrated 

 by sections of the penis, after it has been 

 distended with air and dried. 



Blood-vessels. The blood-vessels of the 

 penis are of large size, and serve to nourish 

 as well as to minister to the functions of 

 the organ. Having entered the cavernous 

 mass, they ramify in the trabecular structure. 

 The arteries of the corpora cavernosa are 

 offsets of the pudic ; the chief branch (artery 

 of the corpus cavernosum ; p. 251) enters at 

 the cms, and runs forwards through the 

 middle of the cavernous structure, distri- 

 buting offsets ; and the rest, coming from, 

 the dorsal artery (p. 251), pierce the fibrous 

 case along the dorsum of the penis. 



In the interior they divide into branches, 

 which ramify in the trabeculae, becoming 

 finer, until they terminate in very minute 

 branches, which open into the intertrabe- 

 cular venous spaces. By the distension of 

 these spaces the erection of the corpora 

 cavernosa is produced. 



The veins spring from the intertrabecular 

 spaces, and some issue along the upper and 

 under aspects of the penis to join the 



dorsal vein ; but the principal trunks escape at the crus penis and 

 pass to the pudic veins. 



CORPUS SPONGIOSUM URETHRA. This constituent part of the 

 penis surrounds the urethra, but not equally on all sides ; for at 

 the bulb only a thin stratum is above the canal, while at the glans 

 penis (fig. 154, I) the chief mass is placed above the urethral tube. 

 Structure. The tissue of the corpus spongiosum is similar to 

 that of the corpus cavernosum ; thus it consists of a fibrous tunic 

 enclosing a trabecular structure with blood-spaces. 



The fibrous covering is less dense and strong than in the corpora 

 cavernosa, and consists only of circular fibres. A septal piece 



FIG. 155. PECTINIFORM 

 SEPTUM OF THE PENIS. 



a. Apertures in the 

 partition. 



6. Separate fibrous 

 processes like the teeth 

 of a comb, which are 

 formed by the circular 

 fibres. 



