1200 



EMBRYOLOGY. 



The gut now becomes rotated upon itself, so that the large intestine is carried 

 over in front of the small intestine, and the caecum is placed immediately below 



Notochord. 



Rathke's pouch 

 (pituitary involution). 



Lung diver- 

 ticulum. 

 Stomach. 



Liver. -\ 



Opening into, 

 yolk sac. 



Allantois- \ *! . 



Blind portion of 

 hind-gut. 



-Wolffian duct. 

 A 



Lung diverticulum. 

 (Esophagus.^ 



Median rudiment of 

 thyroid gland. 

 t Mandibular arch. 

 'Notochord. 



Bathke's 



~ "pouch 

 (pituitary 

 involution). 



Allantois. - -\ 



Blind portion of 

 hind-gut. 



.1 -Wolffian duct. 



Fio. 760. Sketches In profile of two stages in the development of the human alimentary canal. (His.) 

 Fig. A X 30. Fig. B X 20. 



the liver ; about the sixth month the caecum descends into the right iliac fossa, 

 and the large intestine now forms an arch consisting of the ascending, transverse, 

 and descending portions of the colon the transverse portion crossing in front 



