The humerus is the single bone that supports the upper arm region. It extends from the shoulder to the elbow and connects the scapula bone to the radius and the ulna, which support the lower arm. The proximal (upper) end of the humerus consists of a rounded head, a narrow neck, and two bump-like elevations called tubercles. At the distal (lower) end of the humerus are two knob-like protuberances (a condyle) that articulate with the heads of the radius and ulna. Above the condyle are two ... The humerus (Latin: humerus ) is a long bone that forms the skeleton of the free upper arm. Learn about the humerus , the long bone of the upper arm that connects the shoulder and elbow. Find out its anatomical features, articulations, muscle attachments, nerve and vascular structures, and bone composition.
