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Lesser wing

Other Terms: Ala minor (os sphenoidale), Lesser wing of sphenoidal bone, Ingrassia's process, Ala minor ossis sphenoidalis

Description

This is the smaller of two wing-like projections from the body of the sphenoid bone. These are flat, triangular projections of bone. They project anterior and lateral from the dorsum sellae. The optic foramen or canal perforates through their wide base. They form the roof of the superior orbital fissure. The wings articulate with the frontal, ethmoidal, and palatine bones.

Etymology

These are boney landmarks named for their wing-like shape. They are also referred to by the Latin term ala meaning wing.

Latin

Ala minor ossis sphenoidalis

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