FACE AND FRONTAL REGION OF HEAD 119 



The eyelids (palpebrae) are the semilunar curtains provided 

 for the protection of each eyeball. The upper lid is the 

 longer and much the more movable of the two. When the 

 eye is open, the margins of the two lids are slightly concave 

 and the interval between them, rima palpebrarum, is elliptical 

 in outline. When the eye is closed, and the margins of the 

 lids are in apposition, the rima palpebrarum is reduced to a 



Margin of the upper ey 

 lid with openings of 

 ducts of tarsal glands 



Papilla lacrimalis with 

 punctum lacrimale on 

 the summit 



Plica semilunaris 



Caruncula lacrimalis 

 Papilla lacrimalis 



Opening of tarsal glanc 



Tarsal glands 

 shining through the 

 conjunctiva 



FIG. 56. Eyelid slightly everted to show the Conjunctiva (enlarged). 



nearly horizontal line. Owing to the greater length and 

 mobility of the upper lid, the rima, in this condition, is placed 

 below the level of the cornea or clear part of the eyeball. 



At the extremities of the rima palpebrarum the eyelids 

 meet and form the palpebral commissures, and immediately 

 lateral to the medial commissure the rima expands into a 

 small triangular space called the lacus lacrimalis. If the 

 dissector now examines the free margins of the lids he will 

 note that to the lateral side of the lacus lacrimalis they 



