Medically reviewed by Jennifer Steinhoff, MD The humerus is your upper arm bone. It is the longest bone in the upper part of ...

The radius and ulna in the forearm run parallel, connecting your elbow to your wrist. These bones allow you to lift, carry, ...

It is constantly being dissolved and formed and it can repair itself if a bone is broken ... humerus, radius and ulna work with your biceps and triceps to curl or extend your arm.