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-supply. — Palato-lal)ial, facial, and mental arteries. 



Nerve-supply. — Facial nerve. 



2. Levator nasolabialis (Levator labii superioris al^que nasi). — This thin 



Fig. 172. — Muscle.s op Head of Horse, L.\terai^ View. The Panniculus is Removed. 

 a, Levator labii superioris proprius; b, levator nasolabialis; c, mastoido-humeralis; d, sterno-cephalicus; 

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

 inferioris; A', orbicularis oris; /, dilatator naris superior; m, masseter; n, parotido-auricularis; o, zygomatico- 

 auricularis; p, interscutularis; p' , fronto-scutularis, pars 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; 8, scutiform cartilage; 9, zj-gomatic 

 arch; 10, depression behind supraorbital process; 18, temporo-mandibular articulation; 27, facial crest; SO', 

 angle of jaw; 37, external maxillary vein; 38, jugular vein; 39, facial vein; 40, parotid duct; 41, transverse 

 facial vein; 42, masseteric vein; 4^, facial nerve; 44, parotid gland; 45, chin; x, wing of atlas. (After Ellen- 

 berger-Baum, Anat. ffir Kimstler.) 



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. 



