DIGESTIVE SYSTEM 307 



iv. The right central lobe lies against the right 

 half of the diaphragm, and is grooved on its 

 posterior surface for the gall-bladder. 



v. The caudate lobe lies along the right side and 

 dorsal surface of the pyloric end of the 

 stomach. Its posterior margin is hollowed 

 to fit the right kidney : its inner and anterior 

 border is connected by a bridge of liver-tissue 

 with the Spigelian lobe. 



b. The gall-bladder is an elongated thin- walled sac, 

 rather less than an inch in length, of a dark 

 green or brown colour, and lying in the groove 

 in the posterior surface of the right central lobe 

 of the liver. 



c The bile-duct is a narrow tube, about two inches 

 long, running backwards from the smaller and 

 dorsal end of the gall-bladder to open into the 

 dorsal surface of the duodenum, about a third of 

 an inch beyond the pylorus. It receives ducts 

 from the several lobes of the liver, and lies in the 

 mesentery immediately to the right of the large 

 portal vein. 



Open the duodenum opposite to the bile-duct; wash out its 

 contents ; find the aperture of the duct on a small papilla, 

 and insert a small seeker or bristle into it. 



The bile-duct is most readily traced from the duodenum 

 forwards, and may with advantage be first injected with plaster 

 of Paris from a point about half an inch from the duodenum. 



Cut through the mesentery of the small and large intestines. 

 Leaving the duodenal loop and its mesentery untouched ; lay 

 out the alimentary canal on the dissecting -board, so as to show 

 the relations and proportions of its several parts. Take care 

 not to damage the splanchnic ganglia. Avoid all unnecessary 

 injury to the blood-vessels, and ligature any that bleed. 



5. The small intestine, which is directly continuous with 

 the duodenum, is about seven or eight feet in length, 

 and of uniform diameter throughout. 



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