One of the nasal sinuses located behind the nose in the ethmoid bone.
Referring to the ethmoid bone or near to the ethmoid bone.
One of the eight bones of the cranium; a small bone filled with air spaces that is between the eye sockets.
A bone in the base of the skull which separates the cavity of the nose from the membranes of the brain. It is a spongy bone with numerous cavities or sinuses.