The Skeleton Explained: All About the Types of Bones in Your Arm

The arm is composed of several bones that work together to provide structure, support, and facilitate movement. Here are the main types of bones in the arm:

1. Humerus

The humerus is the largest bone in the arm and extends from the shoulder joint to the elbow joint. It is located in the upper arm and connects the shoulder girdle to the forearm. The humerus articulates with the scapula (shoulder blade) at the shoulder joint and the radius and ulna bones at the elbow joint.

2. Radius

The radius is one of the two long bones in the forearm. It extends from the elbow to the wrist on the thumb side of the arm. The radius rotates around the ulna to allow for forearm rotation and contributes to the movement and flexibility of the wrist joint.

3. Ulna

The ulna is the other long bone in the forearm, running parallel to the radius. It extends from the elbow to the wrist on the pinky side of the arm. The ulna provides stability and support to the forearm and helps to form the elbow joint with the humerus.

It’s important to note that the arm also includes other bones, such as the small bones of the wrist (carpals) and hand (metacarpals and phalanges). These bones, along with the muscles, tendons, and ligaments, work together to enable the arm’s complex movements and functions.