🔹 LearnMuscles.com 🔹 Excellence-in-education ✨Atlanto-Axial Joint (AAJ) The atlanto-axial joint (AAJ) is located between the atlas (C1) and the axis (C2). More specifically, there are three articulations between the atlas and the axis: Two paired (left and right) facet joints between the inferior articular processes of the atlas and the superior articular processes of the axis. These are synovial, diarthrotic, planar joints. An atlanto-odontoid joint between the anterior arch of the atlas and