108 



THE STRUCTURE OF MAN 



pinna, and there again further differentiated). Among these 

 may be mentioned certain bundles which separate off from the 



FIG. 71. A, PINNA OF A PRIMATE DIVIDED INTO ZONES, THE SHADED PORTION BEING 



THAT OF THE AUDITORY EMINENCES OF THE EMBRYO, THE UNSHADED THAT OF THE 

 LATER FORMED AUDITORY FOLD ; b, ITS BASE. 



B, pinna of Man, of a Baboon and of an Ox, drawn to the same scale and superposed, 

 s'., spiua or tip of the ear in Man ; s"., the same of the Baboon ; and s"'., the same 

 of the Ox (homologous points) ; C, pinna of Macacus rhesus, with the tip (s.) 

 pointing upwards ; D, pinna of Cercopithecus, with the tip pointing backwards ; 

 E, pinna of Man, with its muscles ; m.a., attollens auriculam ; m.a'., antitragicus ; 

 m.t., tragicus ; m.t'., inconstant muscle bundle, stretching from the tragicus to 

 the edge of the helix ; m.h'., helicis major ; m.h"., helicis minor ; s., tip of the ear 

 (spina) rolled over ; A-D, after Schwalbe ; E, after Henle. 



retrahens auriculam, chief of which are the transversus and 

 obliquus auriculam (auricularis proprius, Euge) which, belonging 

 to the most folded part of the pinna, are very small. 



