atlanto-occipital

adjective

at·​lan·​to-oc·​cip·​i·​tal -äk-ˈsip-ət-ᵊl 

: relating to or being structures (as a joint or ligament) joining the atlas and the occipital bone

The atlanto-occipital joint straddles the spinal cord and the foramen magnum on either side and is V-shaped, slanting caudally and medially.

—Bentley A. Ogoke, Pain Physician

A blow to the neck by a hockey puck may produce arterial rupture where the vertebral artery penetrates the posterior atlanto-occipital membrane or the dura mater.

—Barry J. Maron et al., The Journal of the American Medical Association