OUR FACE FROM FISH TO MAN 



Let us consider further then the general course 

 of embryonic development of the nose. In all 

 mammals, including man and the anthropoid apes, 

 the face in front of the eyes is formed during 

 individual development (Fig. 86) by the growing 



ma 



iphiiirum % 

 Uijrcc. 



nasa^field, 



\ 



B 



maxillary 

 process 



Tnandiiular 

 process 



^Marches 



Fig. 87. Fcetal (A) and Adult (B) Development of the Face in 



Man. (A, from Eidman, after Retzius; 



B, Modified from Keith). 



(A, from Entw. d. Zahne . . ., Hermann Meusser, Berlin.) 



For details, see p. xxxiv. 



together in the mid-line of a system of five flaps or 



rounded processes, four of which represent the 



opposite halves of the cheeks and upper and lower 



lips and jaws, while the fifth, a median area (the 



nasal field) forms the middle of the philtrum of 



the upper lip and the middle part of the nose. 



The sides of the nose are formed from the growing 



together in the mid-line of the nasal field and the 



166 



