THE AURICULAR MUSCLES 



751 



6. The deep auricular or rotator muscles (M. auricularcs profundi s. rotatores 

 auricuhe), two in number, are situated under the seutifonn cartilage and the base 

 of the concha and cross each other. 



(a) The scutulo-auricularis profundus major is the strong(>st of the auricular 

 muscles. It is fiat and is about an im-h witl(>. It arises from the deep face of the 

 scutiform cartilage and j)asses backward to end on and belo\\- the most ])rominent 

 part of the base of the concha (eminentia concha>). 



(6) The scutulo-auricularis profundus minor lies between the base of the con- 

 cha and the preceding nuiscle, antl is best seen when the latter is cut and reflected. 



Fir.. 564. — Muscles of External Ear of Horse, Viewed from Above. 

 On the right .side parts of the superficial muscles have been removed and the scutiform cartilage turned back 

 to displa.v the deeper muscle.s. a. Frontal part, a' , temporal part of fronto-scutularis: 6, interscutularis; c, 

 cervico-scutularis; rf, e, scutulo-auricularis sujjerficialis superior and medius; /, zygoniatico-auricularis; s, scutulo- 

 auricularis superficialis accessorius; o, cervico-auricularis superficialis; q, scutulo-auricularis superficialis inferior; 

 t, scutiform cartilage; m, parieto-auricularis; r, cervico-auricularis profundus ma.ior; u\ cervico-auricularis prof, 

 minor; x, x' , scutulo-auricularis jjrof. major et minor; //, tenijioralis. (Ellenberger-Baum, .\iiat. d. Haustiere.) 



It is flat and about an inch in length. It arises from the posterior part of the deep 

 face of the scutiform cartilage and from the cervico-scutularis, and passes down- 

 ward, l)a('kward, and outward to be inserted into the base of the concha under 

 cover of the preceding muscle. 



7. The tragicus or mastoido-auricularis is a small muscle which arises from 

 the temporal bone just behind the external auditory process and from the annular 

 cartilage; it passes upward to be inserted into the lower part of the anterior border 

 of the conchal cartilage. 



The intrinsic muscles are very small and of little importance. They are as 

 follows : 



1. The antitragicus consists of a few bundles which are attached to the conchal 



