A type of joint (articulation) that allows rotation around a central axis, like a hinge or pivot joint, also called a hinge joint.
From Greek 'cylindr-' (cylinder) plus 'arthrosis' (joint). This medical/anatomical term describes how the joint surfaces interact in a cylindrical manner, allowing rotational movement.
Your neck has a perfect cylindrarthrosis where the first vertebra (atlas) spins around the second vertebra (axis)—this is why you can shake your head 'no' but a giraffe, with a different joint design, cannot move its neck side-to-side as easily!
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