DIMSIONS OF THE DIGESTIVE SYSTEM 



101 



dorsal wall of the abdomen. The common bile duct enters its 

 first portion immediately beyond the pylorus, so that in it materials 

 received from the stomach are mixed successively with bile and 

 with pancreatic juice. The mesenterial intestine is a greatly 



c 



Fig. 53. Developmental stages in the coiling of the intestine. Redrawn 

 with modifications after Zietzschmann. A. Primary intestinal loop. B. The 

 loop twisted through 180°. C. The loop twisted through 360°, intestine 

 diflferentiated as in rabbit, ac, ascending colon; c, caecum; d, duodenum; 

 do, descending colon; i, ileum; j, jejunum; 1, liver; s, stomach; tc, transverse 

 colon. 



convoluted portion, lying chiefly on the left side of the abdominal 

 cavity, and loosely supported by the broad, frill-like mesentery. 

 Here the digestive processes are advanced greatly and a good deal 

 of absorption takes place. From the pylorus to the end of the 



