. The anatomy of the domestic animals. Veterinary anatomy. MUSCLES OF THE NOSTRILS 259 Origin.—The maxilla, close to the anterior extremitj' of the facial crest. Insertion.—The lateral wing of the nostril. Action.—To dilate the nostril. Structure.—The muscle has a flat tendon of origin, passes between the two branches of the levator nasolabialis, and spreads out in the lateral wing of the nostril. The lower fibers blend with the orbicularis oris. Relations.—Superficially, the skin, fascia, and the labial branch of the levator nasolabialis; deeply, the maxilla and the nasal branch of the levato
. The anatomy of the domestic animals. Veterinary anatomy. MUSCLES OF THE NOSTRILS 259 Origin.—The maxilla, close to the anterior extremitj' of the facial crest. Insertion.—The lateral wing of the nostril. Action.—To dilate the nostril. Structure.—The muscle has a flat tendon of origin, passes between the two branches of the levator nasolabialis, and spreads out in the lateral wing of the nostril. The lower fibers blend with the orbicularis oris. Relations.—Superficially, the skin, fascia, and the labial branch of the levator nasolabialis; deeply, the maxilla and the nasal branch of the levator nasolabialis. Blood-supply.—Facial artery. Nerve-supply.—Facial nerve. 3. Transversus nasi.'—This is an unpaired, quadrilateral muscle, which lies between the nostrils. It consists of two Fig. 263.—Nasal and Sdperior Labial Muscles of Horse. Transversus nasi; b, levator labii superioris proprius; b', tendon of h: b' levatorea labii superioris proprii; c, c', c", d, ventral part of lateral! bicularis oris; g, levator nasolabialis, a portion of whicii is removed: ) whicli is removed); i, cornu of alar cartilage: k, nostril; k', uppei naaal bone. (After Ellenberger-Baum, Top. Anat. d. Pferdes.) tendon of two nasi; e, dorsal part of lateralis nasi; /, or- dilatator naris lateralis (the terminal part of of nostril; /, nasal diverticulum; m. Attachments.—Superficial layer, the superficial faces of the laminte of the alar cartilages; deep layer, the convex edges of the cornua of the same. Action.—To dilate the nostrils. Structure.—\t is composed of transverse fleshy fibers, which blend below with the orbicularis. Relations.—Superficially, the skin, fascia, and tendinous expansion of the levator labii superioris proprius; deeply, the alar cartilages, the extremity of the septum nasi, and the palato-labial artery. Blood-supply.—Palato-labial artery. Nerve-supply.—Facial nerve. Lateralis nasi.—This is situated along the margins of the naso-
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