Capsule of atlantooccipital articulation
Encyclopedia
The capsules of the atlantooccipital articulation surround the condyles of the occipital bone
Occipital bone
The occipital bone, a saucer-shaped membrane bone situated at the back and lower part of the cranium, is trapezoidal in shape and curved on itself...

, and connect them with the articular processes of the atlas
Atlas (anatomy)
In anatomy, the atlas is the most superior cervical vertebra of the spine.It is named for the Atlas of Greek mythology, because it supports the globe of the head....

: they are thin and loose.
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