上 sinuses in skull 293973-Diagram of sinuses in skull
Chronic sinusitis is a longlasting sinus inflammation (swelling) and infection It can linger over a period of time, typically longer than 12 weeks The sinuses are four paired cavities (spaces) in the head These spaces are connected by narrow channelsMay , 13 · There are two frontal sinuses located within the frontal bone of the skull They are the most superior of the paranasal sinuses, and are triangular in shape Drainage is via the frontonasal duct It opens out at the hiatus semilunaris, within the middle meatus of the nasal cavitySphenoid sinus located in the sphenoid bone at the base of the skull; Clinical Anatomy Radiology Skull Sinuses Diagram of sinuses in skull