Question

The joint between the upper jaw and rest of the head is known as

• A. Ball and socket joints
• B. Fixed joints
• C. Hinge joints
• D. None of the above

Answer 1

The correct option is B Fixed joints

• The ball and socket joint also called as the spheroidal joint is a joint in which the ball-like rounded surface of a bone moves within a cup-like depression on another bone, this allows greater freedom of movement than any other kind of joint. Example:- Hip joint of mammals.
  
• Fixed joints are the joints which are immovable or nearly immovable. These joints protect the internal organs and also provide a strong base for the articular (movable) joints. Example: Sutures of the skull enclosing brain.
  
• Hinge joints are formed between two or more bones where the bones can only move along one axis to flex or extend. Examples: Ankle, elbow, and knee joints.
  

Therefore, the joint between the upper jaw and the rest of the head (which represents the skull) is the fixed type of a joint as it is immovable (fixed).