4 HEAD AND NECK 



mouths of the glands. On the other hand, the small 

 portion of the margin of each eyelid which bounds the 

 lacus lacrimalis is more horizontal in direction and some- 

 what rounded. It is destitute both of eyelashes and of tarsal 

 glands. At the very point where the eyelashes in each eyelid 

 cease, and the palpebral margin becomes rounded, a small 

 eminence, with a central perforation, will be seen. The 



Margin of the upper eye 

 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 gland 



Tarsal gland 

 shining through the 

 conjunctiva 



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



eminence is the papilla lacrimalis, whilst the perforation, called 

 the punctum lacrimale, is the mouth of a lacrimal duct, which 

 conveys away the tears. Endeavour to pass a bristle into 

 each of the orifices. The upper duct at first ascends, whilst 

 the lower one descends, and then both run horizontally to the 

 lacrimal sac, which lies in a depression in the medial wall of 

 the orbit. 



The conjunctiva is the membram ies the deep 



surfaces of the lids. It is reflected f;om i^-m on to the 



