Answer:
Elbow joint
Explanation:
The elbow joint is a type of hinge joint formed by the trochear groove at the distal end of humerus where it fits into the trochlear notch formed by ulna and radius. The olecranon process prevents the lower arm from over-stretching.
The muscles which operate the joints are in pairs and antagonistic. The muscle that straightens the limb is called the extensor muscle.
