ethmoid bone is single and placed mostly internally, although it projects part
of its lateral surface externally.
has three main parts
Perpendicular plate of
ethmoid placed in the upper part of
Ethmoidal labyrinths or
masses which carry the anterior, posterior and middle ethmoidal air cell groups.
They also are provided with two processes called the superior and middle nasal
crista galli projects from its perpendicular plate together with two alar
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