588 



GENITAL ORGANS OF THE BULL 



their largest part, and an inch or more (ca. 3 cm.) 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: 



Bladd 



er 



/ 





Galea 

 glandis 



Raphe 

 glandis 



Raphe 



prceputii 

 Prepuce 



Fjg. 524 — Anterhir Extremity of Penis of Bull; Left 

 View. (After B.ihm.) 



Fig. 523. — Ixteexal Gexital Organs of Bull; 

 Dorsal View. 

 The right vesicula is sectioned frontally. The 

 dotted line indicates the backward extension of t^he 

 peritoneum. 1, Uretei; 2, body of prostate; 3, vesicula 

 seminalis; 4, urethral muscle; 5, bulbo-urethral gland. 



Fig. 525. — Cross-section of Pelvic Urethra of Bull. 

 1, Prostate gland (pars disseminata); 2, urethra; S, 

 urethral muscle; 4-i aponeurosis. The lumen of the urethra 

 is black and the shaded area around the urethral lumen is 

 the stratum cavernosum. 



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 

 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, T\-hich maintains it in its bent condition and also sends trabeoulae 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 

 glandulje vesiculares is preferred by some anatomists. 



