THE ‘UROGENITAL SYSTEM. 257 
passes from its ventral wall to the linea alba and is the suspen- 
sory ligament. Two others pass one from each side of the 
bladder to the dorsal body wall at the sides of the rectum. 
They are the lateral ligaments of the bladder. They form the 
walls of a partly isolated peritoneal pocket into which the 
rectum ‘passes; this pocket opens craniad into the peritoneal 
cavity. The wall of the bladder is composed of an internal 
epithelium, a layer of plain muscle-fibre bundles which cross 
one another in various directions, and the external peritoneal 
layer. 
SUPRARENAL BODIES. GLANDULAZ SUPRARENALES.— 
The suprarenal bodies are two ovoid bodies about a centimeter 
in the longest diameter, lying craniomediad of the kidneys, but 
usually not touching them. In a fresh condition they are of a 
pinkish or yellow color. They are usually imbedded in fat and 
are covered by peritoneum on their ventral surface. They have 
no duct and are of uncertain function. 
2. The Genital Organs. 
A. THE MALE GENITAL ORGANS. External Genital 
Organs.—The external genital organs are the scrotum and 
penis. 
The scrotal sac or scrotum is a pouch of integument which 
lies ventrad of the anus in the median line against the ischiatic 
symphysis. It is marked by a median groove which indicates 
the position of an internal septum dividing its cavity into lateral 
halves, within each of which is one of the testes. 
The penis (Fig. 111, 7; Fig. 113, 6; see also page 262) lies 
ventrad of the scrotal sac. It projects caudad. It is covered 
by the integument, which projects at its end as a free fold, the 
prepuce. Within the prepuce is the projecting glans penis 
(Fig. 113, 7). It is conical and bears on the ventral side of its 
free end the opening of the urethra, the common urinogenital 
opening. On the side on which the urethra opens the glans is 
connected to the prepuce by a fold of integument, the frenu- 
Jum. The surface of the glans is covered with sharp, recurved, 
horny papille. 
