sphenoidal concha

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concha

 [kong´kah] (pl. con´chae) (L.)
a shell-shaped structure.
concha of auricle the hollow of the auricle of the external ear, bounded anteriorly by the tragus and posteriorly by the antihelix.
inferior nasal concha a bone forming the lower part of the lateral wall of the nasal cavity.
middle nasal concha the lower of two bony plates projecting from the inner wall of the ethmoidal labyrinth and separating the superior from the middle meatus of the nose.
sphenoidal concha a thin curved plate of bone at the anterior and lower part of the body of the sphenoid bone, on either side, forming part of the roof of the nasal cavity.
superior nasal concha the upper of two bony plates projecting from the inner wall of the ethmoidal labyrinth and forming the upper boundary of the superior meatus of the nose.
supreme nasal concha a third thin bony plate occasionally found projecting from the inner wall of the ethmoidal labyrinth, above the two usually found.

sphe·noi·dal con·cha

[TA]
one of a pair of pyramidal ossicles, the spines of which are in contact with the medial pterygoid lamina, the bases forming the roof of the nasal cavity.