Relating to both the atlas vertebra and the mastoid process of the temporal bone in the skull.
From 'atlanto-' (atlas) + 'mastoid' (the bony protuberance behind the ear), describing anatomical relationship.
The atlantomastoid space is where several muscles attach that let you turn and tilt your head—it's a literal crossroads where spine meets skull in one of your body's most flexible joints.
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