6o 



OPHTHALMOLOGY FOR VETERINARIANS 



corneal margin depends upon the animal and the size 

 of the eye. In man the recti muscles are inserted from 



Fig. 21. — Rjght eye of horse: a, Remnants of periorbita; b, levator pal- 

 pebrae superioris; c, obliquus oculi inferior; d, rectus oculi inferior; e, 

 rectus oculi externus; /, rectus oculi superior; g, sclera; g', cornea; h, 

 lacrimal gland; i, frontal nerve; k, frontal artery; /, branch of lacrimal 

 nerve to gland; ni, lacrimal artery; n, zygomatic nerve; o, branch of 

 ophthalmic artery; p, branch of oculomotor nerve to obliquus oculi in- 

 ferior; q, maxillary nerve; r, infra-orbital nerve; s, posterior nasal nerve; 

 ^, great palatine nerve; 2/, small palatine nerve; v, internal maxillary ar- 

 tery; 'ty, buccinator artery (cut); .v, infra-orbital artery; .v', malar artery; 

 )>, sphenopalatine artery; G, great palatine artery; z', small palatine (or 

 staphyline) artery; i, posterior deep temporal artery; 2, j, stumps of 

 orbital margin; 4, facial crest; 5, temporal fossa; 6, foramen lacerum 

 orbitale; 7, anterior end of alar canal; 8, posterior opening of same. 

 (After Ellenberger, in Leisering's Atlas.) 



7 to 7^ mm. from the cornea, while the oblique muscles 

 are inserted much farther back — about 17 to 18 mm. 



