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ethmoid bone





ethmoid bone
Sagittal section of the skull showing the ethmoid bone (white).
Image from Gray's Anatomy

An irregularly shaped bone of the skull which lies between the orbital plates of the frontal bone and anterior to the sphenoid bone.

The ethmoid bone consists of two lateral masses of thin plates enclosing air cells, attached above to a perforated horizontal lamina called the cribriform plate, from which descends a median vertical or perpendicular plate in the space between the two lateral masses.

The ethmoid articulates (joins) with the sphenoid, frontal, maxillary, lacrimal, and palatine bones, the inferior nasal concha, and the vomer. It also enters into the formation of the anterior cranial fossa, the orbits, and the nasal cavity.


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   • ANATOMY AND PHYSIOLOGY