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Uncinate process of ethmoid bone

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Medial wall of left orbit. (Unciate process of ethmoid labeled at left.)

An uncinate process is a part of a spinal vertebra. It is a hook shaped process on the lateral borders (side edges) of the superior (top) surface of the third to the sixth cervical vertebrae. This bony part prevents a vertebra from sliding backwards off the vertebra below it ( i.e. it prevents posterior linear translation movements of the vertebral bodies) and limits lateral flexion.

The Ethmoid bone also has an uncinate process.