CHAPTER VI 

 EYE 



APPENDAGES OF THE EYE. 



1. The Eyelids are two folds of skin, one dorsal, 

 one ventral, which guard the anterior portion of 

 the eyeball. There are no " eyelashes," but the 

 whole external surface of the lid is covered with 

 hair. The inner surface of the lid is covered with 

 mucous membrane, which is continuous over the 

 front of the eyeball, and is known as the conjunc- 

 tiva. The angles where the two eyelids meet are 

 known respectively as the inner canthus and outer 

 canthus of the eye. 



2. The Puncta Lachrymalia are two small open- 

 ings situated on each eyelid a short distance from 

 the inner canthus. They open into two lachrymal 

 canals, which unite to form the lachrymal duct, 

 which opens into the nasal cavity. 



3. The Meibomian Glands are the parallel rows of 

 yellowish glands situated on the inner surface near 

 the edge of each lid. 



4. The Nictitating Membrane, or " third eyelid," is 

 a large fold of membrane arising from the inner 

 canthus of the eye, between the lids and the eye- 



