366 Jacob Parsons Schaeffer. 
21. Frequently the processus uncinatus by a superior curv- 
ing at its dorsal end causes the infundibulum ethmoidale to end 
in a pocket. This pocket is so situated that it directs 
fluids coming to the dorsal end of the infundibulum ethmoidale 
into the sinus maxillaris,—via the ostium maxillare which is in 
the immediate vicinity. 
_ 22. Occasionally branches of the superior alveolar nerves in 
passing to the superior dental plexus pass entirely through the 
walls of the sinus, thence under cover of the mucous membrane 
of the cavity to their destination. Rarely the anterior superior 
alveolar ramus, instead of taking its usual course, passes diagon- 
ally from the roof of the sinus to its ventral wall,—the nerve thus 
suspended freely in the cavity is merely covered with mucous 
membrane. 
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