-found b/t bone, atlas, axis
-specifically adapted for movements of the head
-remember, no IV discs at this point & all joints are classified as synovial
-2 atlanto-occipital membranes (ant and post)
3 atlanto-axial (2 lateral-lateral masses of C1 and superior facets of C2, 1 median-b/t dens of C2 and anterior arch and transverse ligament of C1)
(1 median-dens a pivot joint and 2 facet)..."no" movt.