Essays on practical medicine and surgery (Volume 2) . uteforeign bodies, give rise to great incon-venience, and demand the performanceof a peculiar operation for the relief ofthe patient. (See Art. III. $ 12.) , in prosecuting some examina-tions, post-mortem, with the view of eluci-dating this subject, was surprised to finda series of semilunar valvules, within thecanal, such as have been hinted at, bycertain anatomists, as an occasional occur-rence, but the existence of which has beenrepeatedly denied by others. His atten-tion being once fairly called to this struc-ture, Dr. Horner d
Essays on practical medicine and surgery (Volume 2) . uteforeign bodies, give rise to great incon-venience, and demand the performanceof a peculiar operation for the relief ofthe patient. (See Art. III. $ 12.) , in prosecuting some examina-tions, post-mortem, with the view of eluci-dating this subject, was surprised to finda series of semilunar valvules, within thecanal, such as have been hinted at, bycertain anatomists, as an occasional occur-rence, but the existence of which has beenrepeatedly denied by others. His atten-tion being once fairly called to this struc-ture, Dr. Horner discovered these val-vules in every body which he examinedfor the purpose, and therefore draws thelegitimate conclusion that they are nor-mal and constant. The following descrip- ANUS. (Arutt) 83 tion is drawn from the appearances pre-sented by four different preparations, takenpromiscuously from a considerable numberwhich the Professor did us the favour to submit to examination, and the accompa-nying figure has been executed from oneof them. Fig. I* A vertical section of the anterior parietes of the anus, with the whole canal displayed so as to show the* relations of the sacculi of the middle region, and their relations to the surrounding parts, their orificesbeing marked by bristles. A, A. Columns of the Rectum. R, B. Rudiments of Columns. C. Internal Sphincter. F. ExternalSphincter. I. Rudimentary or imperfect Sacculi. K, K. Radiated folds of the skin, terminating on thesurface of the nates,n. A bristle in one of the sacs. Immediately below the margin of theinternal sphincter we find a series of mem-branous pockets or sacculi, correspondingin number with the grooves between thecolumns of the rectum, one of whichgrooves is directed towards, and termi-nates in, each of the culs-de-sac. On theouter side, the sacculi are lined by themucous membrane of the grooves, pro-longed into the intervals of the hemi-spherical eminences already noticed, butwhich are not sufficiently dist
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Keywords: ., boo, bookcentury1800, bookdecade1840, booksubjectclinicalmedicine
