Ethmoid Bone Anatomy

Crista galli is a vertical projection of the ethmoid bone that serves as an attachment point for the falx cerebri, a membrane that separates the two cerebral hemispheres.

Lateral mass contains the ethmoidal air cells and forms part of the medial wall of the orbit and the lateral wall of the nasal cavity.

Perpendicular plate forms the superior part of the nasal septum, dividing the nasal cavity into two halves.

Ethmoidal air cells are small cavities within the lateral masses of the ethmoid bone that contribute to the paranasal sinuses.

Superior nasal concha is a thin, curved bony plate on the ethmoid bone that forms part of the lateral wall of the nasal cavity and helps filter and humidify inhaled air.

Middle nasal concha is a bony projection from the ethmoid bone that increases the surface area of the nasal cavity for warming and humidifying air.