. Diseases of the rectum and anus: designed for students and practitioners of medicine. imen shown in Plate V was prepared by inject-ing the bowel in situ, under moderate pressure, with paraffin,which was allowed to harden. The rectum was then removedand dried for one week, after which it was cut open and thecast (Plate VI) taken out. The valves were very well shown(Plate V), but not in their usual location. They were uncom- 26 DISEASES OF THE RECTUM AND ANUS monly close together, nearly opposite each other, and formedalmost an annular stricture. The photomicrographs (PlatesVII and VIII) of se
. Diseases of the rectum and anus: designed for students and practitioners of medicine. imen shown in Plate V was prepared by inject-ing the bowel in situ, under moderate pressure, with paraffin,which was allowed to harden. The rectum was then removedand dried for one week, after which it was cut open and thecast (Plate VI) taken out. The valves were very well shown(Plate V), but not in their usual location. They were uncom- 26 DISEASES OF THE RECTUM AND ANUS monly close together, nearly opposite each other, and formedalmost an annular stricture. The photomicrographs (PlatesVII and VIII) of sections of the valves, which show theirstructure very well, were made by Dr. B. H. Buxton, Histolo-gist in Cornell University Medical College, from tissue re-moved from gross specimens prepared by the author. The following description of the constancy, location, andstructure of the valves is based upon the results of the aboveresearches, which, in the main, confirm the experiments ofHouston, Otis, Martin, and Pennington:— In the authors opinion, there is sufficient evidence to war-. Fig. 6.—Rectum Distended with Three-per-cent. Formaldehyde Solution(when Hardened and Opened Showed Valves Beautifully). rant the assertion that the various folds, muscles, rings, andbands described by Houston, Nelaton, Hyrtl, Kohlrausch, andOtis are one and the same thing, namely: Houstons the sphincter-muscles have been destroyed by dis-ease or operation, the valves may check the downward courseof the feces by projecting into the lumen of the bowel, butnot by their constricting powers. In the authors opinion, whenincontinence does not follow destruction of the sphincter-mus-cles it is due, not to the valves, but to the levatores ani, partially under control of the will, and may acquire sphinc-teric action. FLUTE m
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanusdis, bookyear1910
