pancreaticobiliary maljunction (PBM), however, the plica longitudinalis is gently raised and has a longer slope, because it only houses the long common channel (fig. 4). In some post-cholecystectomized patients, the plica longitudinaris is rather flat and not raised, because of unused atrophic sphincter muscles of Oddi. If the gallbladder is absent, as in the rat and horse, the muscular ring of the Oddian zone is poorly developed and strictly duodenal in nature . Hence, in some post-cholecystectomized patients the Oddi sphincter muscle is atrophied similar to that of the gallbladder that is absent animals. Therefore, the shape of papilla of Vater, especially in its protuberation, is based on housing ducts and thickening of the sphincter muscle.
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