Essays on practical medicine and surgery (Volume 2) . eveit thedirection of their motion (fig. 1. 1.), andare reflected upward on the mucous mem-brane. At this point (i. e. where they arereflected upward) they are collected intogroups, one corresponding with the baseof each column of the rectum; to whichit adheres pretty closely in its group then pursues its course up-ward in the duplicature of the column;but it speedily resumes its muscular as-pect, the fibres being rapidly displayed asthey advance, until they are finally insert-ed into the mucous membrane, sometimesas high as an
Essays on practical medicine and surgery (Volume 2) . eveit thedirection of their motion (fig. 1. 1.), andare reflected upward on the mucous mem-brane. At this point (i. e. where they arereflected upward) they are collected intogroups, one corresponding with the baseof each column of the rectum; to whichit adheres pretty closely in its group then pursues its course up-ward in the duplicature of the column;but it speedily resumes its muscular as-pect, the fibres being rapidly displayed asthey advance, until they are finally insert-ed into the mucous membrane, sometimesas high as an inch and a half or two inchesabove the inferior edge of the sphincterinternus (fig. 1. m.). It is obvious thatthis arrangement gives these fibres thepower to draw down or even to revert thebase of the columns, and a portion of themucous coat of the rectum, thus explain-ing more fully the real nature of prolap-sus ani; especially that species of it whichoccurs most frequently in childhood. Asimilar structure is obvious in the horseand other /£ A vertical section of the Parietes of the Anus, passing through themiddle line of one of the columns of the Rectum, and the neighbour-ing parts. C. The Internal Sphincter, with its arched fibres transversely di-vided. D. D. The plane of arched fibres of the muscular coat, similarlydivided. E. The point of greatest cnntraction of the internal sphincter. F. The External Sphincter. G. The point of greatest contraction, of the same muscle. H. The plane of longitudinal fibres of the muscular coat, longi-tudinally divided, i. Some of these fibres terminating in the internalsphincter. k. Others, terminating in the external sphincter. 1. Theremaining longitudinal fibres, collected into a semi-tendinous fascicu-lus, passing over the lower margin of the internal sphincter, to be re-verted upward within the duplicature of the column, m. These re-verted fibres again becoming muscular, and terminating in the mu-cous coat. I». The mucous co
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Keywords: ., boo, bookcentury1800, bookdecade1840, booksubjectclinicalmedicine
