ethmoid bone

Cribriform Plate

Cribriform Plate The structure indicated is the cribriform plate. The cribriform plate of the ethmoid bone sits lateral to the crista galli and has numerous foramen which permit the passage of the olfactory nerves which pass from the nasal mucosa to the olfactory bulb. Learn more about the bones of the skull in this tutorial.
cribriform plate

Middle Nasal Concha

Middle Nasal Concha The structure indicated is the middle nasal concha. There are three nasal conchae which make up the lateral wall of the nasal cavity. The nasal conchae are curved bones which create channels for the flow of air through the nose. There are four air channels: Inferior nasal meatus (underneath inferior nasal concha) Middle nasal meatus (underneath medial nasal concha) Superior nasal meatus (underneath superior nasal concha) Spheno-ethmoidal recess (between superior nasal concha and nasal roof) The superior and middle nasal concha are formed from the ethmoidal labyrinths of the ethmoid bone. The ethmoidal labyrinths lie on either …

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Middle Nasal Concha

Perpendicular Plate of Ethmoid Bone

Perpendicular Plate of Ethmoid Bone The structure indicated is the perpendicular plate of the ethmoid bone. The ethmoid bone is one of the bones in the skull that separates the nasal cavity from the brain. There are three parts of which the ethmoid bone is comprised: Cribriform plate Ethmoidal labyrinth (one on either side) Perpendicular plate The perpendicular plate of the ethmoid bone extends inferiorly from the base of the cribriform plate and contributes to the median nasal septum. It has the following articulations: Anteriorly: spine of frontal bone Posteriorly: sphenoidal crest Inferiorly: septal cartilage anteriorly, vomer posteriorly Learn more …

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Perpendicular Plate of Ethmoid Bone