What forearm muscle starts in the arm and ends on the radius bone?

Scapula. The scapula is also called the shoulder blade. It’s a triangle-shaped flat bone that’s connected to the body by mostly muscle. It attaches the arm to the torso.

Clavicle. The clavicle is also called the collarbone. Like the scapula, it attaches the arm to the torso. It also helps to distribute force from the upper part of the arm to the rest of the skeleton.

Humerus. The humerus is a long bone in the upper arm. It’s located between the scapula and the elbow joint. Many muscles and ligaments in the arm are attached to the humerus.

The upper arm also contains several joints, including the:

Acromioclavicular joint. The scapula and the clavicle meet at this joint.

Glenohumeral joint. This is the joint where the scapula and humerus meet.

Sternoclavicular joint. The clavicle connects to the sternum (breastbone) at this joint.

Forearm

The forearm is the area between the elbow joint and the wrist. Its two major bones are the radius and the ulna:

Radius. The radius is located on the side of the forearm closest to the thumb. It twists around the ulna and can change its position depending on how the hand is moved. There are many muscles attached to the radius that aid in movement of the elbow, wrist, and finger joints.

Ulna. The ulna runs parallel to the radius. It’s on the side of the forearm that’s closest to the pinky finger. Unlike the radius, the ulna is stationary and doesn’t twist.