DIGESTIVE SYSTEM. 



139 



forms part of the maxillary arch, and finally most of 

 the upper jaw. In this manner the stomodeum 



Nasal pit. 



Lateral protuberance. 



Globular protuberance. 



xillary arch. 



ndibtilar arch. 



Fig. 100. Development of the face of the human embryo (His): 

 A, Embryo of about twenty-nine days; B, embryo of about thirty-four 

 days; C, embryo of about the eighth week; D, embryo at end of the 

 second month. 



becomes divided into an olfactory region and the 

 mouth cavity proper. The stomodeum at this stage 



