Recess 
CUP: 
Fig. 22 Fig. 23 
Fics. 18 to 23. Drawings of specimens showing septa and crescentie pro- 
jections on the walls of the sinus maxillaris. Note how these projections form 
recesses within the cavity. (Fig. 22 is modified from E. Zuckerkandl, Normaie 
und pathologische Anatomie der Nasenhdéhle und ihrer pneumatischen Anhiinge). 
C. P., = crescentic projection; O. M., = ostium maxillare; 0. M. A., = ostium 
maxillare accessorium; S. Max., =sinus maxillaris. 
