344 



THE ;\IUSCLES OF THE OX 



frontalis; it divides into two layers, between which the levator labii superioris 

 proprius and the lateral dilator of the nostril pass. The superficial layer ends in 

 the nostril and upper lip, the deep layer on the accessory (lateral) nasal cartilages 

 and on the nasal process of the premaxilla. 



The levator labii superioris proprius arises on and before the facial tuberosity 

 and terminates by several tendons in the muzzle. It passes between the two layers 

 of the preceding muscle, blending in part with the deep layer. 



The zygomaticus is much stronger than in the horse. It arises on the masse- 

 teric fascia, and ends chiefly in the upper lip. 



Fig. .300. — Muscles of Head of Ox; Lateral View. 

 a. Levator labii superioris proprius; b, levator nasolabialis; c, trapezius; c', brachiocephalicus; d, d', sterno- 

 cephalicus; c, omo-hyoideus; /, dilatator naris lateralis; g, zygumaticus; g', malaris; h, buccinator; i, depressor labii 

 iuferioris; k, orbicularis oris; m, masseter; n, parotido-auricularis ; o\ zygoruatico-auricularis and scutulo-auricularis 

 superficialis inferior; o", scutulo-auricularis superficialis superior; o'*', scutulo-auricularis superficialis accessorius; 

 p, p', scutularis; u, frontalis; w, mylo-hyoideus; 1, concha; 3, 3, posterior and anterior borders of 1; 8, scutiform 

 cartilage; 9, zygomatic arch; 28', ramus of mandible; 37, external maxillary vein; 38, jugular vein; 3D, facial vein; 

 44, parotid gland; 60, 51', submaxillar^^ gland; dotted line at 50 indicates position of atlantal lymph gland, and the 

 parotid lymph gland Ues partly under parotid gland, just in front of 4Ai 58, medial palpebral ligament; 59, laryngeal 

 prominence. (After Ellenberger-Baum, Anat. fiir Kunstler.) 



The depressor labii superioris arises just in front of the facial tuberosity, and 

 divides usually into two branches, which terminate in a number of tendons that 

 form a network in the muzzle and upper lip. 



The incisivus inferior is a small, rounded muscle, which arises on the body of 

 the mandible below the second and third incisors, and ends in the lower lip, blending 

 with the orbicularis. 



The depressor labii iuferioris is thin, and does not extend as far backward 

 as in the horse; only the anterior end is distinct from the buccinator. 



