28 VETEEINAEY OPHTHALMOLOGY. 



their secretions, which emerge by minute orifices on 

 the free border of the lids. The lashes are longer and 

 stronger and more abundant in the upper lid. Though 

 the lashes of the lower lid are few, they are reinforced 

 by some long bristly hairs, which are just like the 

 tentacular of the lips. 



The Meibomian Glands. — Analogous to sebaceous. 

 They are lodged near the posterior surface of the tarsus, 

 arranged like currants on a stem. They open by 

 minute orifices upon the free border of the lids behind 

 the cilia. Each gland consists of a central tube with 

 a number of openings around its sides. The unctuous 

 matter they secrete facilitates the retention of the tears 

 over the conjunctivse. Supra-orbital, lachrymal and 

 orbital branch of the superior dental arteries, forming 

 thick network indirectly connected around the coi-nea 

 with the ciliary system, through the episcleral, are the 

 arteries. Lymphatics form a close network around the 

 cornea. Nerves from the fifth pair enter at inner and 

 outer angles of the eye, form a thick plexus and end 

 free — some by club-shaped expansion. These nerve 

 fibers are non-medullated. 



Membrana Nictatans. — " Third or winking eyelid."— 

 Saw. At the inner angle of the eye. Its composition 

 is of a fibro-cartilaginous framework, elastic, irregularly 

 shaped, prismatic at its base, which is thick, and thin 

 anteriorly, where it is covered by the conjunctiva. 

 Behind is a strong cushion of adispose tissue, which is 



