(ESOPHAGUS, STOMACH, AND INTESTINES, 



105 



Fig. 125. PROFILE SKETCHES OF SUCCESSIVE STAGES IN THE DEVELOPMENT OF THE ALIMENTARY CANAL 



IN THE HUMAN EMBRYO. (His.) 



Ch, notochord ; Sd (in B), median rudiment of thyroid ; P, pancreas ; Lbg, bile duct ; Ds, vitelline 

 duct ; Zg (in C and D), tongue ; N, permanent kidney ; d (in D), cloaca ; An, anus in course of form- 

 ation ; Kg, sexual prominence ; St, tail ; Cc t ccecum coli ; Tr, trachea ; K t larynx. The other letter- 

 ing as in fig. 123. 



