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Fig. 8. Cross-section at the entrance of the common bile-duct into the intestinal 
wall of dog. X 30. 
outer longitudinal muscle coat which have been pushed aside to allow 
passage to the common bile-duct. 
The Sphincter of the Common Bile-duct in the Rabbit. 
The rabbit’s duodenum was macerated in a mixture of nitric acid, 
glycerine and water. After the mucous membrane had been removed 
the structure represented by Fig. 9 was found. The course of the 
common bile-duct through the intestinal wall is parallel to that of the 
fibres of the inner circular muscular coat. This is 
just the reverse of what is found in the dog. At es 
the first glance, one can see that the greater part m. | LO ; 
of the duodenal portion of the common bile-duct < ANN at R 
is covered with muscle fibres of the inner circular Tih N 
muscular coat. 
Fig. 9. Macerated duodenal portion of the common bile- cı 
duct of rabbit. The mucous membrane, muscularis mucosae, | 
and submucosa of the intestine have been removed. | 
Some of these fibres of the inner circular muscular coat run up 
on the common bile-duct, A, continue for some distance and ter- 
minate abruptly near the orifice of the duct, R. Other fibres of the 
inner circular muscular coat run up on the duct, continue forward a 
short distance, but finally bend, some to one side, others to the oppo- 
site side, C, and runing down over the side of the duct, become 
