Hinge Joint

A hinge joint is a type of synovial joint that allows movement in one direction. The elbow joint in the arm is an example of a hinge joint. It allows for flexion and extension, which are movements that involve bending and straightening of the arm. The hinge joint is crucial for daily activities like lifting, pushing, and pulling.

Hand Bones

The hand contains several hinge joints, which are formed by the bones of the fingers and the metacarpal bones of the hand. These joints allow for flexion and extension movements of the fingers, such as bending and straightening. The hinge joints are important for gripping and manipulating objects.

Humerus

The humerus is the long bone in the upper arm that connects the shoulder to the elbow. It is the largest bone in the upper body and provides attachment points for many muscles involved in arm movement.

Radius

The radius is the bone on the thumb side of the forearm that connects to the wrist. It is the shorter of the two bones in the forearm. The radius rotates around the ulna to allow for movements of the wrist and forearm.

Ulna

The ulna is one of the two bones in the forearm, the other being the radius. It is located on the same side as the pinky finger. The ulna plays an important role in forearm rotation and supports the arm's weight when the elbow is bent.