Humerus

Definition

The humerus is the long bone in the upper arm that runs from the shoulder to the elbow, connecting with both the scapula at the shoulder joint and the radius and ulna at the elbow joint. It plays a critical role in both the mobility and stability of the upper limb.

Related terms

Scapula:

A flat, triangular-shaped bone located in the upper back which articulates with the humerus to form the shoulder joint.

Radius:

One of two forearm bones, it is lateral to the ulna and articulates with both the humerus at one end (elbow) and wrist bones at its other end.

Ulna:

The longer, medial bone of the forearm that runs parallel to the radius and joins with it at both ends to enable wrist motion