Inferior bone is the pairs of nasal conchae is not part of the ethmoid bones. Inferior portion of spheroid bone forms the superior nasal conchae.
The ethmoid bone is spongy , irregular bone of the skull. The superior and middle nasal conchae are processes of the ethmoid bone, and the inferior nasalconcha is formed by separate cranial bone.
There are four ethmoid bone parts and three pairs of conchae in nose on either side of the septum.Behind the process of lacrimal of the inferior nasal conchae lies a broad thin plate, the ethmoidal process which ascends to join the enunciate process of ethmoid from lower border a thin lamina.
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