THE AURICULAR MUSCLES 



873 



and is inserted by a flat tendon into the lower part of the convex surface of the 

 concha under cover of the cervico-auricularis superficiahs. 



4. The posterior auricular muscles (Mm. auriculares aborales) are three in 

 number : 



(a) The cervico-auricularis superficiaUs is a thin triangular sheet. It is wide 

 at Its ongm from the nuchal crest and the adjacent part of the ligamentum nucha, 

 and becomes narrower as it passes outward to be inserted into the medial side' of 

 the convex surface of the concha. 



(b) The cervico-auricularis profundus major arises from the ligamentum 

 nucha, partly beneath and partly behind the preceding muscle. It is directed 

 outward and is inserted into the postero-lateral aspect of the base of the ear, partly 

 under cover of the parotido-auricularis. 



(c) The cervico-auricularis profxmdus minor arises under the preceding 



Fig. 700. — External Ear op Horse and its Muscles; Lateral View. 

 The cervico-auricularis superficiaUs has been removed. ^3, Posterior border; 3, anterior border of auricula; 8, 

 scutiform cartilage; 9, zygomatic arch; n, parotido-auricularis; o, zygomatico-auricularis ; o', scutulo-auricularia 

 superficiaUs inferior; o", scutulo-auricularis superficiahs medius et superior; p, interscutularis; p', fronto-scutularis 

 (pars temporalis) ; g, cervico-auricularis profundus major; s, anterior oblique muscle of head ; ^ splenius; ;/, tendon of 

 brachiocephalicus; x, wing of atlas. (After Ellenberger-Baum, Anat. fiir Kiinstler.) 



muscle and passes downward and outward to be inserted into the lowest part of 

 the convex surface of the concha, partly under cover of the parotid gland. 



5. The parotido-aiuricularis (s. M. auricularis inferior) is a ribbon-like muscle 

 which lies on the parotid gland. It is thin and wide at its origin from the fascia on 

 the lower part of the parotid gland, and becomes somewhat narrower and thicker 

 as it ascends. It is inserted into the conchal cartilage just below the angle of junc- 

 tion of its borders. 



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

 auriculae), two in number, are situated under the scutiform cartilage and the base 

 of the concha and cross each other. 



(a) The scutulo-amicularis profundus major is the strongest of the auricular 

 muscles. It is flat and is about an inch wide. It arises from the deep face of the 



