Ol 2 3 4

Fig. 2. PV, control (6 days, M) on outer view. The plica longitudinalis shows a cylindrical protuberance. AP = Accessory papilla; PV = papilla of Vater.

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 [3]. 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.

Fig. 3. Histology of the plica longitudinalis. The protuberance portion consists of the terminations of the CBD and MPD and CC. CBD = Common bile duct; CC = common channel; MPD = main pancreatic duct. (Reproduced with permission from [11].)

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