<prompt> The movement at the following joint permits a person to say NO by head movement:Atlanto-occipital jointAtlanto-axial jointC2-C3 jointC3-C4 joint  <response>: Ans. b Atlanto-axial jointRef: Grays 38th ed521 Atlanto-occipital between skull and Cl joint permit nodding of head as when indicating approval or yes and, Atlantoaxial joint permits the head to be turned from side to side i.e. rotation as indicating disapproval, the NO movement. 