Editing Skull (section)

====Cavities and foramina====
[[File:3d CT scan animation.gif|thumb|upright=.8|CT scan of a human skull in 3D]]

The skull also contains [[Sinus (anatomy)|sinuses]], air-filled cavities known as [[paranasal sinuses]], and numerous [[List of foramina in the human body#Skull|foramina]]. The sinuses are lined with [[respiratory epithelium]]. Their known functions are the lessening of the weight of the skull, the aiding of resonance to the voice and the warming and moistening of the air drawn into the [[nasal cavity]].

The foramina are openings in the skull. The largest of these is the [[foramen magnum]], of the occipital bone, that allows the passage of the [[spinal cord]] as well as [[nerve]]s and [[blood vessel]]s.