AURICULAR GROUP. 177 



RETRAHENS INTERNUS, 



{Cervico-auricularis' Inter nus. ) 



(FiQ. 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 

 Ae external ear. 



ABDUCENS. 



{Deprimens Aurem — Parotido-auricularis.) 



{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 tbe 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. 



