Title: The anatomy of the horse : a dissection guide
Identifier: anatomyofhorsedi00mcfa (find matches)
Year: 1922 (1920s)
Authors: McFadyean, John, Sir, 1853-1941
Subjects: Horses; Horses -- Anatomy
Publisher: Edinburgh : Johnston
Contributing Library: Webster Family Library of Veterinary Medicine
Digitizing Sponsor: Tufts University

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360 THE ANATOMY OF THE HORSE. Structure of the Urethra. The spongy portion has been described with the penis. The prostatic and membranous portions have a mucous lining, external to which is a muscular coat of non-striped fibres. Observe the following points in connection with the interior of the intra-pelvic part of the urethra (Fig. 50). On the middle line of the roof of the tube, close behind the communication with the bladder, there is a mucous eminence—the colliculus seminalis, or verumontanum. In the gelding this is often small, and sometimes hardly recognis- able, but in the stallion it is sometimes a con- siderable eminence, like the tip of the little finger. At each side of this projection is the orifice of the ejaculatory duct. These orifices in the stallion are sufficiently large to permit of the tip of the little finger being insinuated into them. This should be remembered, as the point of catheter, if not guided along the floor of the urethra, might easily pass into one of them. At the summit of the colliculus, and therefore on the middle line, is a very minute opening—the orifice of the uterus masculinus. Insert a fine bristle into it, and guide it on into the tube. On the wall of the urethra at each side of the colliculus, observe an irregular series of minute orifices which belong to the ducts of the prostate gland. Behind these on each side, notice another series of small openings with a linear arrangement. These are the orifices of the ducts of Cowper's glands. Insert bristles into a few of each set of openings, and guide them on into the respective glands. Close to the neck of the bladder the epithelium of the urethra is of the same character as in the bladder, but behind that point it is simple and columnar. Structure of the Vesiculte Seminales. The walls of these are composed of fibrous, fibro- muscular, and mucous layers; and contain many tubular glands, which discharge their secretion into the cavity, where it mixes with the semen. The bulbous portion of each vans deferens has the same structure. Directions.—The student must now return to the pelvis, at the roof of which he is to dissect the lumbosacral plexus of nerves, and the
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Fig. 50. Bladder and Intrapelvic portion of Urethra opened from below (Leyh). 1. Vasdeferens; 1'. Bulbous part of the same ; 2. Douglass's fold, joining the vasa defer- entia; 3. Bladder; 4. Vesi- cula seminalis; 5. Orifices of ureters; 6. Prostate ; 7. Veru- montanum with orifices of ejaculatory ducts; 8. Orifice of prostatic vesicle; 9. Cow- per's gland; 10. Orifices of ducts of prostate ; 11. Orifices of ducts of Cowper's gland ; 12. Corpus cavernosum ; 13. Corpus spongiosum with ure- thra in its centre.

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