THE EAR. 



419 



(I)} The following three muscles connect the scutiform 

 cartilage with other parts of the external ear. 



M. rotator auris or scutuloauricularis inferior. A flat 

 craniocaudal band of fibres lying between the auricle and the 

 temporal muscle. 



Origin on the scutiform cartilage, 

 just caudad of the insertion of the 

 frontoscutularis, of which this muscle 

 seems to be a continuation. The 

 muscle passes caudad as a band seven 

 or eight millimeters wide, curving 

 about the medial surface of the auri- 

 cle, and is inserted on the caudo- 

 medial surface of the eminentia 

 conchae. 



Relations. Lateral surface with 

 the auricular cartilage ; medial surface 

 with the temporal muscle. 



Action. Rotates the external ear 

 mediad and caudad. 



M. adductor auris superior (Fig. 

 169, i; Fig. 63, /). (Part of the 

 auricularis anterior of man.) 



Origin on the dorsal surface of 

 the scutiform cartilage for its entire 

 length. The fibres form a continua- FIG. 169. CARTILAGE OF THE 

 tion of those of the frontoscutularis; ^ E r s ERNAL EAR ' WITH Mus ' 

 they pass dorsocaudad and are in- a -i, as in Fig. 168. i, M. 

 serted into the spina helicis or cranio- ^ du ? r auris su P erior ( cut ); 2 - 



1 M. adductor auris medius (cut); 



medial margin of the auricular carti- 3, M. helicis; 4, M. tragicus later- 

 lage. This muscle lies in the fold 3*4 I^Sl, M. 



of skin that Connects the Craniomedial adductor auris inferior (cut); 8, 

 i r j-u -i .L-i -j.i M. depressor conchce (cut); q, M. 



angle of the auricular cartilage with conch us extemus; to, part of 

 the head, so that it is covered on both M - auricularis extemus; u, M. 



. i , . , abductor auris lonaus (cut). 



sides by integument. 



Action. Draws the auricle craniad. 



M. adductor auris medius (Fig. 169, 2). (Part of the 



