750 



THE SENSE ORGANS AND SKIN OF THE HORSE 



largely covered by the preceding muscle. It arises from the posterior prolongation 

 and the adjacent part of the superficial face of the scutiform cartilage, and is 

 inserted into the convex surface of the conchal cartilage internal to the preceding 

 muscle, the two crossing each other at an acute angle. 



(6) The parieto-auricularis is flat and triangular; it arises from the sagittal 

 crest under cover of the cervico-scutularis, runs outward and a little backward, 

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

 concha under cover of the cervico-auricularis superficialis. 



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

 number. 



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

 at its origin from the occipital crest and the adjacent part of the ligamentum nuchse, 



i 



Fic. 503. — ExTKKNAL Ear of Horse anu it.s Miihci.ks, Latkral View. 

 2, Posterior border, 3, anterior border of auricula; S, scutiform cartilage; 9, zygomatic arch; n, parotido- 

 auriculari.s; o, zygomatico-auricularis; </, scutulo-auricularis superficiali.s inferior; o", scutulo-auricularis super- 

 ficialis TTiedius et superior; p, interscutularis; p', fronto-.scutularis (pars temporalis); q, cervico-auricularis 

 profuiiilus major; s, small (or anterior) oblique muscle of head; t, splenius; y, tendon of mastoido-humeralis; 

 c, iiixstoido-humeralis; t, wing of atlas, (.\ftcr Kllenherger-Bauin, Anat. fiir Kiinstler.) 



and becomes narrower as it pass(>s outward to be inserted into the inner side of 

 the convex surface of the conclui. 



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

 nuclue, jxirtly beneath and i)artly behind the preceding muscle. It is chrected 

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

 partly under cover of the parotido-auricularis. 



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

 muscle and passes dowiiwiinl 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-auricularis (s. M. auricularis inferior) is a ribbon-like muscle 

 which lies on the parotid ghuid. 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 passes upward. It is inserted into the conchal cartilage just below the angle 

 of junction of its borders. 



