Acute Sinusitis
Anatomical background Humans have 4 sinuses, the maxillary sinuses, the frontal sinuses, the ethmoid sinuses, and the sphenoid sinuses. They are connected to the nasal cavity by 1-3 mm narrow bony openings called ostia and are lined with a thin respiratory epithelium with goblet cells and seromucous glands. The ciliated hairs provide clearance of mucus … Acute Sinusitis
