680 



NERVOUS SYSTEM OF THE HORSE 



438, 439) is the largest of the three branches. It runs forward in the palatine canal 

 and groove and ramifies in the hard palate and gums. It also supplies twigs to the 

 soft palate, and gives off branches which pass through the accessory palatine fora- 

 mina to supply the mucous membrane of the inferior meatus. 



The liranchps of tlie two nerves anastomose in the hard palate and form a plexus about the 

 branches of the palatine arteries. 



Fio. 514. — Dissection of Head of Horse. 

 The masseter and suijerficial muscles and the parotid gland are in great part removed, a, a. Levator labii 

 superioris |)roprius; b, 6, levator na.solabialis; c, dilatator naris inferior; d, buccinator; e, common mass of buc- 

 cinator and depressor labii inferioris; /, depressor labii inferioris; o, masseter; h, orbicularis oculi; i, temporalis; 

 k, occipito-hyoideus; k' , stylo-maxillaris; /, stenio-cephalicus; l', tendon of same; w), omo-hyoideus; 

 n, crico-pharyngeiLs; o, mastoid tendon of mastoido-humeralis; p, splenius; q. inferior buccal and labial glands; 

 r, superior buccal glands; s, remnant of jiarotid gland; t, submaxillary gland; u, anterior cervical (subparotid) 

 lymph glands; v, probe pas.sed into diverticulum nasi; w, cornu of alar cartilage; x, internal palpebral ligament; 

 y, wing of atlas; 2, scutiform cartilage of ear; /, external nasal nerve; ^, anterior nasal nerve; 3, superior labial 

 nerve; 4, anterior i)art of sui)erior buccal nerve; 5, buccinator nerve; 6, 6", inferior alveolar nerve; 6", mental 

 nerve-continuation of 6; 7, masseteric nerve; 8, facial nerve (cut); 9, superficial temporal nerve; 10, anastomosis 

 between 9 and 1^; 11, internal auricular nerve; 12, posterior auricular nerve; 13, digastric nerve; 14, cervical 

 branch of facial nerve (cut); 15, auriculo-palpebral nerve; 16 lacrimal nerve; 17, frontal nerve; 18, infratroch- 

 lear nerve; 19, n. zygomaticus s. subcutaneus mahc; 20, spinal accessory nerve; 21, ventral branch of spinal ac- 

 cessory nerve (to sterno-cephalicus); 23, ventral end branch of first cervical nerve; 2S, thyro-laryngeal artery; 

 24, internal maxillary artery; 2o, masseteric artery; 2f>, great (posterior) auricular artery; 27, external branch of 

 20; 2S'. deep auricular artery; .29, s\iperficial temporal artery; .W, transverse facial artery; 31, facial artery; 32, 

 inferior labial artery; .^3, sujierior laliial artery; 34, lateral nasal artery; 35, dorsal nasal artery; 30, angular artery 

 of eye; 37, labial twigs of i)alato-lal)ial arter.\ — left uncolored by oversight; 38, branch of buccinator artery; 39, 

 buccinator vein; 40, vena reflexa; 41, 4~, jugular vein; 4'i- external maxillary vein; 44, inferior cerebral vein; 

 46, stump of great auricular vein; 4S, ramus of maiulible; 47, facial crest; 48, zygomatic arch; .^9, i)aroti<l duct. 

 (After Ellenberger-Baum, Top. .\nat. d. Pferdes.) 



(8) The lesser or posterior palatine nerve (N. palatinus minor s. posterior), 

 also termed the staphyline, is much the smallest of the three branches (Figs. 438, 

 439). It passes downward and forward with the palatine vein in the groove at the 

 inner side of the tul)er maxillare and ramifies in the soft palate. 



The sphenopalatine sanKJia and plexus (Fig. 51.5) lie on the perpendicular part of the palate 

 bone and the pterygoid process under cover of the maxillary nerve. The afferent fibers of the 



