The sinuses are hollow cavities within the facial bones. Sinuses are not fully developed until after age twelve. When people speak of sinus infections, they are most frequently referring to the maxillary and frontal sinuses.
Review Date: 1/23/2008
Reviewed By: Alden J. Pearl, MD, Clinical Assistant Professor, Department of Otolaryngology, State University of New York Health Science Center at Brooklyn, Brooklyn, NY. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.