system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
The movement at the following joint permits a person to look towards the right or left -
assistant
The correct answer is  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).