AURICULAR GROUP. 177 



RETRAHENS IXTERNUS. 



( Ce r v ico-a u r icidaris Intermix. ) 



(Fie. 72. /.) 



Thin, fleshy, and situated below the preceding muscle. 

 Origin. The same as the two last named. 

 Insertion. To the dilated lower part of the conchal car- 

 tilage. 



Relation. Externally with the medius and the parotid gland. 

 Action. It assists the medius. 



MASTOIDO-AURICULARIS. 

 (FiG. 72. g.) 



Situated deeply, at the base and inner side of the concha, this 

 muscle is very small, flat, and slender. 



Origin. From the external auditory meatus. 



Insertion. To the base of the concha. 



Action. It draws the concha downwards, and thus shortens 

 the external ear. 



ABDUCENS. 



(Deprimens A urem Parotido-auncularis.) 

 (PL. II. 1. FIG. 70. a.) 



Situated below the root of the ear, and on the outer side of 

 the parotid gland, it is flat and thin below, narrower and 

 thicker above. 



Origin. From the external surface of the parotid gland. 



Insertion. To the external part of the base of the concha. 



Relation. Externally with a thin aponeurotic portion of the 

 panniculus ; internally with the parotid gland. 



Action.. It draws the ear downwards and outwards. 



INTRINSIC MUSCLES. 



The intrinsic muscles of the external ear are the scuto-auri- 

 cularis, externus and internus. 



