108 THE STRUCTURE OF MAN 
pinna, and there again further differentiated). Among these 
may be mentioned certain bundles which separate off from the 
yy ee mM.Q. 
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; 0, ITS BASE. 
B, pinna of Man, of a Baboon and of an Ox, drawn to the same scale and superposed, 
s’., spina 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 ; 
£, 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, Ruge) which, belonging 
to the most folded part of the pinna, are very small. 
