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sinuses
Paranasal sinuses are air-fille spaces, communicating with the nasal cavity, within the bones of the skull and face.
Trivia about sinuses
These body cavities can contain blood or can be hollow, as in the bones around the nose
You have 4 pairs of these air-filled passages, 2 in the forehead, 2 in the cheekbones
A cold that lasts longer than a week may indicate inflammation of these airspaces in the skull
Connected to the nose on each side are hollow cavities known as these from the Latin for "curves"