groove for vertebral artery

groove for ver·te·bral ar·ter·y

the sulcus on the superior aspect of the posterior arch of the atlas that transmits the vertebral artery medially toward the foramen magnum.
Farlex Partner Medical Dictionary © Farlex 2012
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The latter one was an expected result, since the superior surface of the atlas posterior arch is most commonly converted into a groove for vertebral artery, as described in classic anatomical literature.
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