Sinuses are hollow cavities containing blood or air. Cranial venous sinuses drain into internal jugular vein. Paranasal air sinuses are four cavities in nose bones
Largest paranasal sinus located in maxilla, draining into middle meatus. Pyramid-shaped with mean volume of about 10 ml. Contains three recesses: alveolar, zygomatic, and infraorbital. Lined with mucoperiosteum with cilia for drainage
Sinus is a sac or cavity in any organ or tissue. Paranasal sinuses are air cavities in cranial bones near nose. Sinusitis indicates inflammation of sinus membrane linings
Sinusitis is inflammation of mucous membranes lining sinuses. Acute lasts less than 4 weeks, chronic lasts 12 weeks or more. Affects 10-30% of people yearly in US and Europe
Frontal sinuses are mucosa-lined airspaces behind brow ridges. Each sinus measures 28mm height, 24mm breadth, 20mm depth. Sinuses are absent at birth, appearing during second year. Sinuses are sexually dimorphic, more prominent in males
Nasal sprays deliver medications locally or systemically through nostrils. Substances can be absorbed quickly through nose. Used for conditions like congestion and allergic rhinitis