28 TOPOGRAPHICAL ANATOMY OF THE 



temporal bone, and forms a continuation of the narrower part of 

 the conchal cartilage. 



The Muscles of the Ear. 



21. scididaris. — The thin scutular muscle, which lies immediately 

 underneath the skin, is divisible into two parts. (1) The froiito- 

 scutular inuscle (m. frontoscutularis) consists of two bands, one of 

 which springs from the zygomatic arch, the other from the external 

 frontal crest of the frontal bone. (2) The interseiUular muscle 

 (m. iuterscutularis) arises from the external sagittal crest and the 

 superior nuchal line.^ Some of the fibres of the two interscutular 

 muscles are continuous across the middle line. 



The insertion of the scutular muscle is into the anterior, lateral and 

 medial borders of the scutular cartilage. 



Mtii. auriculaves anterioves. — Four short muscles, arranged about 

 the anterior and medial part of the ear, are generally included in the 

 group of anterior auricular or adductor muscles. Beginning with the 

 most anterior, they are arranged in the following order. (1) A thin 

 fiat muscle arises from the zygomatic arch and the fascia over the 

 adjacent part of the parotid, and is inserted into the concha not far 

 from the tragus. (2) A short muscular band takes origin from the 

 superficial surface of the scutular cartilage and is inserted into the 

 concha near the foregoing. (3) A short muscle arises from the deep 

 face of the posterior medial angle of the scutular cartilage and is 

 inserted into the anterior border of the concha. (4) A narrow but 

 fairly long muscle, apparently a continuation of the interscutular, 

 passes from the posterior medial angle of the scutular cartilage to the 

 medial surface of the concha. 



31. auricularis inferior. — The inferior auricular muscle is thin but 

 of some length. Its origin is from the fascia covering the ventral part 

 of the parotid gland. The muscle narrows somewhat towards its 

 insertion into the conchal cartilage close to the intertragic notch. 



Mm. auriculares poster lores. — Three muscles fall within this 

 group. One of them is the long levator : the others are the long and 

 short abductors. The long levator arises from the ligamentum nuchae 

 close to its occipital attachment. It narrows and is inserted into the 

 medial surface of the conchal cartilage. The long levator is in the 

 same plane as the scutular muscle. 



Dissection. — Reflect the scutular and long levator muscles by cutting 

 through them close to their origins. 



' The most posterior part of the interscutular muscle is sometimes described as 

 a separate muscle, M. cervicoscntularis. 



