The "yes" joint is a uniaxial, hinge joint capable of flexion and extension.
1 joint between the right inferior articular facet of atlas and the right superior articular facet of axis
1 joint between the left inferior articular facet of atlas and the left superior articular facet of axis
The "no" joint is a uniaxial, pivot joint capable of rotation.
1 joint between the anterior arch of atlas and the dens of axis