UROGENITAL SYSTEM. 



and deeper one in which lies the corpus spongiosum ; each ends 

 distally in a blunt point whose apex is received in a hollow in 

 the glans. The corpus spongiosum expands, at its distal end, 

 into a conical cap (glans penis) which covers the ends of the 

 corpora cavernosa, its prominent margin (corona) projecting 

 past them; the urethra traverses it and ends at its apex in a 

 slit-like opening (meatus urinarius). The skin on the body is 

 thin, freely movable, and destitute, except near the root, of 

 hairs; on its urethral aspect is a median raphe continuous 

 with that of the scrotum. Distally the skin forms a free fold 

 (prepuce) which overlaps the glans, is then reflected onto the 

 penis just above the corona, and is then continued over the 

 glans (firmly attached to it) to the meatus urinarius. [1170] 



At the root of the penis the corpora cavernosa diverge later- 

 ally (crura penis), enlarging at first and then tapering, to be 

 attached to the inner part of the pubic arch ; each is covered 

 by the Ischio-cavernosus. The corpus spongiosum enlarges in 

 a spherical mass (bulb of the urethra) , which rests on and is 

 attached to the triangular ligament; on the back and under 

 surface of the bulb there is usually a median groove indicating 

 the fusion of two original halves (hemispheria) . A strong and 

 triangular fibrous band (suspensory ligament) runs from the 

 front of the symphysis to the capsule of the penis. [1171] 



Structure. Each corpus cavernosum is enclosed in a fibrous 

 coat (tunica albuginea), which fuses with its fellow and forms 

 an incomplete septum (septum pectiniforme) with nearly par- 

 allel, slit^like openings between the corpora. Fibrous strands 

 (trabeculae) from the deep surface of the tunica albuginea form 

 a sponge-like framework. The corpus spongiosum has a simi- 

 lar, but thinner, fibrous coat and finer trabeculae. [1172] 



Prostate. This' is chestnut-shaped, an inch and a quarter 

 or a half wide, three-fourths of an inch long, and an inch and 

 a quarter vertically. The upper surface (base) lies against the 

 under aspect of the bladder (near the urethral orifice), and is 

 continuous with it mesially but separated from it laterally and 



[239] 



