588 GENITAL ORGANS OF THE BULL 
their largest part, and an inch or more (ca. 3 em.) in thickness. The dorsal surface 
of each faces upward and medially and is partially covered with peritoneum. The 
ventral surface faces in the opposite direction and is non-peritoneal. Each may be 
regarded as consisting of a very thick-walled, sacculated tube, bent on itself in a 
tortuous manner. This tube, if straightened out, would be about ten inches (25 
Processus 
urethra 
Galea 
glandis 
| 
= Raphe 
glandis 
Raphe 
prepulr 
Prepuce 
Pie. 524 —Anrertor Extremity or PeNnts oF Butt; Lerr 
View. (After Bohm.) 
Fic. 523.—InTERNAL GENITAL ORGANS OF BULL; Fig. 525.—Cross-secTion OF Pretvic URETHRA OF BULL 
Dorsa View. 1, Prostate gland (pars disseminata); 2, urethra; 3, 
The right vesicula is sectioned frontally. The urethral muscle; 4, aponeurosis. The lumen of the urethra 
dotted line indicates the backward extension of the is black and the shaded area around the urethral lumen ic 
peritoneum. 1, Ureter; 2, body of prostate; 3, vesicula the stratum cavernosum. 
seminalis; 4, urethral muscle; 5, bulbo-urethral gland. 
cm.) in length. They are commonly unsymmetrical in size and shape. Short | 
branches are often given off from the chief tube. The excretory duct opens at the 
. . . . 6 | 
colliculus seminalis, just lateral to the ductus deferens. | 
| 
The structure of the vesicula is masked by a thick capsule of fibrous tissue and unstriped | 
muscle, which maintains it in its bent condition and also sends trabecule between. the alveoli. 
There is a central canal into which the secretion formed in the alveoli passes. _The cavities (central 
canal and alveoli) are lined with columnar epithelium. On account of this structure the term — 
glandule vesiculares is preferred by some anatomists. } 
