FACE AND FRONTAL REGION OF HEAD 139 



under ordinary circumstances, passes through the puncta into 

 the ducts and thence through the lacrimal sac and naso- 

 lacrimal duct to the nose ; and if the secretion becomes so 

 abundant that it cannot be removed by evaporation and 

 drainage, part flows through the rima as tears. 



Lacrimal gland _ 



superior part 

 Temporal muscle ~ 



Temporal fascia \*v 



Excretory ducts ^K 



Lacrimal gland ^ 

 lower part 



Infra-orbital nerve 

 Maxillary sinus 



Buccinator 



Conjunctiva 

 superior fornix 



Puncta lacrimalia 

 Lacrimal ducts 

 Lacrimal sac 

 Medial palpebral 

 ligament 



Naso-lacrimal duct 

 Middle concha 

 Muco-periosteum 

 Plica lacrimalis 



Inferior meatus 

 Inferior concha 



FIG. 64. Dissection of Lacrimal Apparatus. 



The Conjunctival Sac. The conjunctival sac is the potential 

 space between the eyelids and the eyeball. It opens externally 

 through the rima and communicates with the lacrimal sac 

 through the puncta and the lacrimal ducts. 



The Puncta Lacrimalia. It has been noted already that 

 the punctum lacrimale of each lid lies at the lateral margin 

 of the lacus lacrimalis (p. 120). Small probes should now be 



