FASCLH AND MUSCLES OF THE HORSE 
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Structure—The muscle arises by a thin aponeurosis. The belly is also thin, 
and divides into two branches, between which the lateral dilator of the nostril passes. 
The dorsal branch reaches the nostril and upper lip, blending with the lateral di- 
lator; the ventral one is much smaller, and blends at the labial commissure with 
the orbicularis and buecinator. 
Relations.—Superficially, the skin, fascia, and lateral dilator (in part); deeply, 
Tue M. cuTANEUS Is REMOVED. 
Fic. 261.—Muscies oF HEAD OF Horse; LATERAL VIEW. 
superioris proprius; 6, levator nasolabialis; c, brachiocephalicus; d, sterno-cephalicus; d’, 
tendon of d; e, omo-hyoideus; /, dilatator naris lateralis; yg, zygomaticus; h, bucecinator; 7, depressor labii inferioris; 
k, orbicularis oris; 1, lateralis nasi, dorsal part; m, 
p’, fronto-scutularis, pars temporalis; g, cervieo-auricularis profundus major; r, 
», occipito-mandibularis; y, mastoid tendon of brachiocephalicus; 
a, Levator labii 
masseter; m, parotido-auricularis; o, zygomatico-auricularis; p, 
interscutularis; cervico-auricularis 
superficialis; s, obliquus capitis anterior; ¢, splenius; 
2, posterior, 3, anterior, border of external ear; 8, scutiform cartilage; 9, zygomatic arch; 10, orbital fat; 18, temporo- 
facial crest; 30’, angle of jaw; 37, external maxillary vein; 38, jugular vein; 39, facial 
13, facial nerve; 44, parotid gland; 45, chin; 
mandibular articulation; 27, 
vein; 40, parotid duct; 417, transverse facial vein; 42, masseteric vein; 
+ + 
x, wing of atlas. By an oversight the superior buccal branch of the facial nerve is shown crossing over instead of under 
the zygomaticus. (After Ellenberger-Baum, Anat. fiir Kiinstler.) 
the levator labii superioris proprius, lateral dilator (in part), buccinator, branches 
of the facial vessels and nerve, and the infraorbital artery and nerve. 
Blood-supply.— Facial and palato-labial arteries. 
Nerve-supply.— Facial nerve. 
3. Levator labii superioris proprius.—This lies on the dorso-lateral aspect of 
the face, partly covered by the preceding muscle. 
Origin.—The lacrimal, malar, and maxillary bones at their junction. 
