The movement at the following joint permits a person to look towards the right or left -
Atlanto - occipital (between the skull and C1) joint permit nodding of the head (as when indicating approval or yes) and Atlanto-axial 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