86 EQDINE ANATOMY. 



two borders united by commissures or canthi, the free 

 border showing the openings 'of the Meibonian glands. 

 Structure : 1 — fibrous plate having on its free border 

 2 — the tarsus ; 3 — muscles, the orbicularis-palpebrum 

 and orbito-palpebrum ; 4 — integuments represented by 

 the "skin and conjunctiva; 5. — ej^e-lashes; 6 — Mebo- 

 nian glands. 



Membrana nictitans or third eyelid, or winking 

 EYELID. — A fibro cartilage situated at the inner angle 

 of the eye. 



Lachrymal apparatus — lachrymal gland. — Situ- 

 ated on the superior face of the globe, having numerous 

 ducts called hygrophthalmic canals. 



Lachrymal cardncula. — A round body in the na- 

 sal angle of the eye. 



Puncta lachrymalis. — Little openings on each eye- 

 lid at the nasal commissure. 



Lachrymal ducts. — Continuation of the puncta, and 

 emptying in the 



Lachrymal sac. — Little reservoir lodged in the 

 lachrymal fossa and continuous with the lachrymal 

 duct ; opening at the lower commissure of the nostrils 

 by one and sometimes two orifices. 



Essential organ — globe or the eye. — Divided 

 into membranes and humours or media. 



Membranes — 1. Sclerotic. — Two faces, the external 



