The laws and mechanics of circulation, with the principle involved in animal movement . gestion, for compelling thesecretions into the duodenum, at once the purpose of thisarrangement. But as the biliary secretion is going on all thewhile, we have a special arrangement in the gall-bladder forstoring the bile in the interim of digestion ; and this mechan-ics also contains several very interesting features. Thus, thegall-bladder occupies an elevated position against the liver-substance, to which it is fastened by an overlying layerof peritoneum and connective tissue fibres, while its neckis occu
The laws and mechanics of circulation, with the principle involved in animal movement . gestion, for compelling thesecretions into the duodenum, at once the purpose of thisarrangement. But as the biliary secretion is going on all thewhile, we have a special arrangement in the gall-bladder forstoring the bile in the interim of digestion ; and this mechan-ics also contains several very interesting features. Thus, thegall-bladder occupies an elevated position against the liver-substance, to which it is fastened by an overlying layerof peritoneum and connective tissue fibres, while its neckis occupied by a spiral valve (Fig. 8 ), the whole whippedoff to one side of the main hepatic duct. Hence, whenthe orifice of the duct closes during the interim of diges- MUSCULAR FORCE FOR THE BILE. 229 tion the effect would be to cause reflux of the bile up thecystic duct, the force in the diaphragm compelling thiscircumstance. Muscles and nerves to the gall-bladder % As we have already said, muscles and nerves are theprovision for producing force; hence, they must relate to the. Fig. 86.—Longitudinal Section of Duodenum, showing tne crescentic folds of thevalvulae conniventes, pancreatic, hepatic and cystic ducts, together with the spiralvalve at the neck of the gall-bladder.—Gray. bile, for compelling it into the cavity during the interim ofdigestion, and for compelling it into the intestines in corre-spondence with the functions in the latter, muscular andnervous force being applied all along the line for increasingthe actions and producing correspondence ; otherwise, this also 230 AUTOMATISM IN THE GALL-DUCTS. would be meaningless. According to Iltnle, the coats of thegall-bladder are formed of layers of connected tissue, alternatingwith lamina? of unstriped muscles, the fibres crossing each otherin all directions, the nerves for the most part springing fromthe solar plexus. It results from this arrangement in theparts that the gall-bladder, inclusive of the ducts,
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