THE ESOPHAGUS, STOMACH AND INTESTINE 



J 75 



The large intestine, as seen in 9 mm. embryos (Fig. 179), forms a tube 

 extending from the caecum to the cloaca. It does not lengthen so rapidly 



A B C 



t ~_ FIG. 181. Three stages showing the development of the digestive tube and the mesen- 

 teries in the human fetus (Tourneux in Heisler).!, Stomach; 2, duodenum; 3, small intestine; 

 4, colon; 5, yolk stalk; 6, caecum; 7, great omentum; 8, mesoduodenum; 9, mesentery, 10, 

 mesocolon. The arrow points to the orifice of the omental bursa. The ventral mesentery is 

 not shown. 



as the small intestine, and, when the intestine is withdrawn from the um- 

 bilical cord (at 42 mm. C R), its cranial, or caeca! end lies on the right side 



Ascending 

 mesocolon 



Ascending colon 



Cacum 



Processus T+jjjj? N^fffo Processus _ 



vermiformis ^^^ x*^ vermiformis 



FIG. 182. The caecum and vermiform process of a human fetus of 50 mm. (Kollmann): A, 

 from the ventral side; B, from the dorsal side. 



and dorsal to the small intestine (Fig. 181). It extends transversely to 

 the left side as the transverse colon, then, bending abruptly caudad as the 



