Ethmoid bone


Between the orbits along the anterior portion of the cranium floor, the ethmoid bone composes the roof of the nasal cavity.

The perpendicular plate projects to form the the superior portion of the nasal septum, which then segregates the nasal cavity into two separate but equal chambers. The nasal fossa refers to these separate chambers of the nasal cavity.


The ethmoid sinus is then constructed by the large mass of bone known for its fragile and delicate nature. These are also extended from the perpendicular plate which encompasses both sides of the delicate bone structure.

The delicate bone structure holds precious ethmoidal air cells.


Ethmoid bone
Image: Ethmoid Bone

The crista galli which is reminiscent of a spine attached to the perpendicular plate, projects into the cranial cavity with intention of being used for the meninges attachment site. These meninges cover the brain. Next come the turbinates, which are crafted from two scroll-like shapes of the ethmoid bone and adhere to the lateral walls of the nasal cavity.

This construction creates the middle and superior nasal conchae, which are the independent terms for the turbinates. The cribriform plate can be found along the floor of the cranium. It sits firmly at right angles to the perpendicular plate and is riddled with numerous cribriform foramina which permits the passage of olfactory nerves.

The olfactory nerves extend from the lining of epithelial cells of the nasal cavity.

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