The movement at the following joint permits a person to look towards the right or left :
B. i.e. Atlanto - Axial Joint Atlanto - occipital (b/w skull & C1) joint permit nodding of head (as when indicating approval or yes)& Atlantoaxial joint permits the head to be turned from side to side i.e. rotation (as indicating disapproval, the no movement)
Atlanto-occipital joint
Atlanto-axial joint
C2-C3 joint
C3-C4 joint