The ethmoid is a small, unpaired, somewhat cuboidal-shaped bone of the neurocranium. It is positioned in the midline between both orbits and below the anterior cranial fossa.💡 The ethmoid is exceedingly fragile, light and has a spongy structure. It contains numerous air cells and consists of thin bony plates. Usually, it is hard to find ethmoid as a unit because of its fragile nature. 🦴 The ethmoid contributes to the medial wall of the orbit, the superior and lateral aspects of the nasal cavit