Chapter 2 The Phylogenetic History of

Paranasal air sinuses have long been of great interest to anatomists working on mammals in general and primates in particular; clinically oriented human anatomists probably have generated the largest proportion of the literature. Paranasal pneumaticity, however, is not restricted to mammals, and numerous other clades of vertebrates exhibit air-filled epithelial diverticula of the nasal cavity. Although paranasal sinuses in nonmam-malian vertebrates often have been given the names of their presumed mammalian counterparts, the homologies of some of these sinuses have only recently bee