. A Reference handbook of the medical sciences embracing the entire range of scientific and practical medicine and allied science . Flc. 3219.—Maierateii Duodenal Portion of the Common Bile Durtof Man. The mucous lueinbrane. musoularis muiosas, and sub-mucosa of the intestine bave been removed. X 5. (Hendrickson.) This arrangement is bilateral. The fibres marked IRrepresent some bundles of muscle which (shown in , IR) form an independent ring of muscle around thecommon bile duct, between it and the duct of Wirsung. At // are seen muscle fibres which nm almost entirelyaround the duct of
. A Reference handbook of the medical sciences embracing the entire range of scientific and practical medicine and allied science . Flc. 3219.—Maierateii Duodenal Portion of the Common Bile Durtof Man. The mucous lueinbrane. musoularis muiosas, and sub-mucosa of the intestine bave been removed. X 5. (Hendrickson.) This arrangement is bilateral. The fibres marked IRrepresent some bundles of muscle which (shown in , IR) form an independent ring of muscle around thecommon bile duct, between it and the duct of Wirsung. At // are seen muscle fibres which nm almost entirelyaround the duct of Wirsung; but as these fibres approachthat side of the pancreatic duct which is nearest the com- mon bile duct, they turn abruptlj and run up on theduct of Wirsung in a longitudinal direction. They grad-ually diminish in volume as they ascend the duct. Thisstructure is bilateral. See also Fig. 3320, H. Fig. 3219 represents the structures seen upon removalof the mucous membrane from the intestinal wall in theregion of the duodenal papilla. The inner circular mus- IV. Fio. 3220.—Macerateil Duodenal Portion of the Common Bile Duct ofMan. All of the intestinal coats have been removed. X 5. (Hen-drickson.) cular coat of the intestine is represented by CI. Tliefirst point to demand attention is the penetration of theinner circular muscular coat by the common bile the spot of penetration there is a simple separationof the muscle bundles of the inner circular muscle coat. At jSaic bundles of muscle running around the com-mon bile duct (see also Fig. 3330, S). These are inde-pendent rings of muscle which embrace the duct. Now,if we look farther back on the common bile duct, nearthe point at which it penetrates the inner circular mus-cular coat, we observe muscle bundles, X which do notrun entirely around the duct. These muscle bundles arevery intimately mixed with the imlependeut musclerings which completely embrace the duct. The former,however, upon reaching the level of th
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