Text Appearing Before Image: 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 Text Appearing After Image: Fig. 523.—Internal Genital Organs of Bull; Dorsal View. The right vesicula is sectioned frontally. The dotted Hne indicates the bacicward extension of the peritoneum. 1, Ureter; 2, body of prostate; 3, vesicula seminaUs; 4, urethral muscle; 5, bulbo-urethral gland. Fig. 52.5.—Cross-section of Pelvic Urethra of Bull. 1, Prostate gland (pars disseminata); 2y urethra; S, urethral muscle; 4, aponeurosis. The lumen of the urethra is black and the shaded area around the urethral lumen ic 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 vesic-ula is masked by a thick capsule of fibrous tissue and luistriped muscle, which maintains it in its bcnl rondilidn and also sends trabecule betwci'ii llir alveoli. There is a central canal into whicli I he .sciict inn fornied in the alveoli passes. The ia\ il iis (central canal and alveoli) are lined with ciiluninar epithelium. On account of this structure the term glandular vesiculares is preferred by some anatomists.
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