This irregular bone forms part of the orbital complex, floor of the cranium, roof of the nasal cavity, and part of the nasal septum. Features of this bone include: | cribriform plate - superior surface of the ethmoid perforated by olfactory foramina through which the olfactory nerves pass. | | crista galli - prominent ridge in the middle of the cribriform plate and an attachment point for the falx cerebri. | | lateral masses - entire bony masses attached on either side of the cribriform plate. The lateral masses include: | superior nasal conchae and middle nasal conchae - scroll-like medial projections into the nasal cavity. | | ethmoidal labyrinth - cells in the interior of the lateral masses that open into the nasal cavity. |
| | perpendicular plate - bony partition underneath the cribriform plate that forms part of the nasal septum. |
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