214 



FASCIA AND MUSCLES OF THE HORSE 



former. Most of the fibers run parallel to the free edges of the lips and have no 

 direct attachment to the skeleton. 



Action. — It closes the lips. 



Blood-supphj. — Palato-labial, facial, and mental arteries. 



Nerve-supply. — Facial nerve. 



2. Levator nasolabialis (Levator labii superioris alseque nasi). — This thin 





Fig. 172. — Musci-es op Head of Horse, Lateral View. The Panniculus i.s Removed. 

 a. Levator labii superioris pro{)riu.s; h, levator nasolabialis; c, luastoido-humeralis; d, sterno-cephalicus; 

 d' , tendon of d; e, omo-hyoideus; /, dilatator naris lateralis; g, zygomaticus; h, buccinator; /, depressor labii 

 inferioris; k, orbicularis oris; I, dilatator naris superior; m, ma.sseter; n, jjarotido-auricularis; o, zygomatico- 

 auricularis; p, interscutularis; p', fronto-scutularis, jjars temporalis; q, cervico-auricularis profundus major; 

 r, cervico-auricularis superficialis; s, obliquus capitis anterior; t, splenius; v, stylo-maxillaris; y, mastoid tendon 

 of mastoido-humeralis; 2, posterior, 3, anterior, border of external ear; S, scutiforui cartilage; 9, zygomatic 

 arch; 10, dejjression behind sujjraorbital process; IS, temi)oro-niandibular articulation; 27, facial crest; 30', 

 angle of jaw; 37, external maxillary vein; 3S, jugular vein; 39, facial vein; 40, parotid duct; 41. transverse 

 facial vein; 42, masseteric vein; 43, facial nerve; 44, parotid gland; 4<'>, chin; x, wing of atlas. (After ICUen- 

 berger-Baum, Anat. fiir Kiinstler.) 



muscle lies directly under the skin, and chiefly on the lateral surface of the nasal 

 region. 



Origin. — The frontal and nasal bones. 



Insertion. — (1) The upper lip and the outer wing of the nostril; (2) the com- 

 missure of the lips. 



Action. — (1) To elevate the upper lip and the commissure; (2) to dilate the 

 nostril. 



I 



