Assertion: frontal sinus | /r/HasProperty | air-filled cavities
Facets:
Source sentences:
text: The frontal sinuses are air-filled cavities located at the lower midline of the forehead, at the top of the bridge of the nose.
text: The frontal sinus is an air-filled space that is usually formed in the later teenage years.
text: The frontal sinuses are air-filled cavities located at the lower midline of the forehead, at the top of the bridge of the nose.