THE NERVOUS SYSTEM OF THE OX 



839 



The facial nerve divides into its two terminal branches before reaching the 

 border of the jaw. The superior buccal nerve is the larger of the two; it crosses 

 the masseter much lower than in the horse. The relatively small inferior buccal 

 nerve runs beneath the parotid or in the gland substance parallel with the border 

 of the lower jaw, crosses under the insertion of the sterno-cephalicus, and runs for- 

 ward along the depressor labii inferioris. At the point where it crosses the facial 



Fig. 666. — Superficial Nerves of Head of Ox. 

 Nerves: a. Facial; a', a", a"', superior buccal and primary branches; 6, deep auricular; c, posterior auricular; 

 d, d' , d", auriculo-palpebral and primary branches; e, parotid plexus; /, digastric; g, g' , inferior buccal; ff", anasto- 

 mosis between g and a'; h, superficial temporal; i, k, I, branches of infraorbital; m, buccinator; m', branch of m to 

 zygomaticus and malaris muscles; m", branch of m to parotid gland; n, branches of infratrochlear; o, frontal; p, p', 

 p", lacrimal; g, dorsal branch of accessory; r, auricular branch of second cervical ; r', r", branches of r; s, cutaneous 

 branch of second cervical; s', anastomotic branch connecting s and t; t, i' , t" , third cervical and branches; u, zygo- 

 matic. Muscles: 1, Frontalis (part removed) ; 2, levator nasolabialis (part removed); S, origin of levator labii 

 superioris proprius; 4, malaria; 5, 5', stumps of zygomaticus; 6, buccinator; 7, masseter; S, sterno-cephalicus; 10, 

 cleido-mastoideus; 11, 11', cleido-occipitalis; IS, zygomatico-auricularis; 13, fronto-scutularis; 14, scuto-auricularis 

 superficialis superior; 15, scuto-auricularis superficialis accessorius; 16, cervico-scutularis; 17, 17', stumps of parot- 

 ido-auricularis. 13, 18', Remnants of parotid gland; 19, 19', mandibular gland; 9, jugular vein; 30, facial vein. 

 (After Sohachtschabel.) 



vein and parotid duct it gives off an anastomotic branch to the superior nerve. 

 The auriculo-palpebral nerve is large. 



The vagus bears — in addition to the relatively large jugular ganglion — a 

 ganglion nodosum at the point of origin of the anterior laryngeal nerve. The 

 trunk is large. The pharyngeal branch is large and anastomoses with the anterior 

 and external laryngeal nerves. The latter commonly arises directly from the trunk. 

 The dorsal oesophageal trunk communicates with the splanchnic nerve, contri- 

 butes twigs to the hepatic plexus, and ramifies chiefly on the right surface of the 



