File:The anatomy of the horse; a dissection guide (1884) (18194618615).jpg

Title: The anatomy of the horse; a dissection guide
Identifier: anatomyofhorsed00mcfa (find matches)
Year: 1884 (1880s)
Authors: McFadyean, John, Sir, 1853-1941
Subjects: Horses
Publisher: New York, Jenkins
Contributing Library: NCSU Libraries
Digitizing Sponsor: NCSU Libraries

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Text Appearing Before Image:
348 THE ANATOMY OF THE HORSE. with the penis. The prostatic and luembranous portions have a miicmts lining, external to which is a imiscuhxr coat of non-striped fibres. Observe the following points in connection with the interior of the intra-pelvic part of the urethra (Fig. 44). On the middle line of the roof of the tube, close behind the communication with the bladder, there is a mucous eminence—the colliadus seminalis, or verumontanum. In the gelding this is often small, and sometimes hardly recognisable, but in the stallion it is sometimes a considerable 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 utenxs masculinus. Insert a fine bristle into it, and giiide 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 open- ings 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 Vesicul^e Seminales. The walls of these are composed of fibrous, fibro- muscular, and mucous layei-s; and contain many tubular glands, which discharge their secretion into the cavity, Avhere it mixes with the semen. The bulbous portion of each vas deferens has the same structure. Directions.—The student must now return to the pelvis, at the roof of which he is to dissect the lumbo-sacral plexus of nerves, and the branches of the internal iliac artery (Plate 48). Thereafter he is to examine the pyrifoiinis and obturator internus muscles.
Text Appearing After Image:
Fig. 44. Bladder and intrapelvic PORTION OF Urethra OPENLD FROM BELOW (Uyh). 1. Viis deferens; 1'. Bulb- ous part of the s<ame; 2. Peri- toneal fold joining the vasa deferentia ; 3. Bliidder ; 4. Vesicula Beminalis ; 5. Ori- fices of ureters ; 6. Prostate ; 7. Verumontanum with ori- fices of ejaculatory ducts; 8. Orifice of prostatic vesicle ; 9. Cowper's gland ; 10. Ori- fices of ducts of prostate ; 11. Orifices of ducts of Cowper's gland; 12. Coipus caver- nosum ; 13. Corpus spongi- osum with urethra in its centre.

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