52 



HUMAN EMBRYOLOGY AND MORPHOLOGY. 



and antihelix ; one above the cleft to form the helix. The pos- 

 terior margin of the ear is continuous with the lobule, and grows 



otocyst 



margin 

 ^antihelix 



antitragus 

 %. lobule 



visceral cleft 

 mandible 

 ^maxilla 



Fig. 37.— Showing the Tubercles which arise round the First Visceral Cleft to form 

 the External Ear. 



helix 



cms helicis 



tragus 



Darwin's point 

 ear margin 

 antihelix 



V" / antitragus 



position of cleft—! ''-0- "/ 



Fig. 3S.— Showing the part of the Adult Ear formed by each Tubercle. 



from the tissue behind the tubercles which form the antihelix 

 and antitragus. The auricular tubercles may not fuse com- 

 pletely and thus leave fistulae between them. Such fistulae are 



