344 THE MUSCLES 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.—Muscies oF Heap or Ox; LaTrerayu VIEW. 
a, Levator labii superioris proprius; 6, levator nasolabialis; c, trapezius; c’, brachiocephalicus; d, d’, sterno- | 
cephalicus; e, omo-hyoideus; f, dilatator naris lateralis; g, zygomaticus; g’, malaris; h, buccinator; 7, depressor labii | 
inferioris; &, orbicularis oris; m, masseter; n, parotido-auricularis; o’, zygomatico-auricularis and scutulo-auricularis 
superficialis inferior; 0’, scutulo-auricularis superficialis superior; o’’’, scutulo-auricularis superficialis accessorius; 
p, p’, scutularis; u, frontalis; w, mylo-hyoideus; 1, concha; 2, 3, posterior and anterior borders of 1; 8, scutiform 
cartilage; 9, zygomatic arch; 28’, ramus of mandible; 37, external maxillary vein; 38, jugular vein; 39, facial vein; 
44, parotid gland; 50, 51’, mandibular gland; dotted line at 50 indicates position of atlantal lymph gland, and the 
parotid lymph gland lies partly under parotid gland, just in front of 44; 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 inferioris is thin, and does not extend as far backward F 
as in the horse; only the anterior end is distinct from the buccinator. 
