<prompt> The joint between the atlas and axis is:Ball and socket jointClosely related to the first cervical nerveAllows rotation of the headSupported by the alar ligaments  <response>: First cervical vertebra is known as Atlas.Second cervical vertebra is known as Axis.Special joint between Atlas, Axis and Occipital bone:Atlanto-Occipital joint:It is a synovial joint - ellipsoid type.Allows flexion and extension of head on neck as like nodding up and down.Atlanto-Axial joint:It is a pivot type of joint.Allows rotatory movement of head on neck as like saying NO - right and left rotation.The dens of axis forms a pivot, around which the atlas rotates, permitting rotatory motion of neck possible. 