Radius Posterior

One of the two short, thick bones of the forearm. The radius is located on the lateral side of the ulna and connects to the wrist bone (carpal bone) on the thumb side of the hand. It and the ulna also form the elbow with the humerus bone. The radius is a long bone and the ulna is bigger and longer than it is. The radius is slightly curved along its’ length and articulates with the capitulum of the humerus, the radial notch, and the head of the ulna.

Anterior | Posterior

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Radius Posterior

The ulna is the major contributor of the elbow joint, while the radius primarily contributes to the wrist joint. The joint at the wrist where the radius joins is known as the styloid process of the radius. The radial styloid process is a projection of bone on the lateral surface of the distal radius bone. It extends at a slant or angle downward into a strong conical projection.

The tendon of the brachioradialis attaches at its’ base, and the radial collateral ligament of the wrist attaches to its’ apex (the tip of a pyramidal or rounded structure). The lateral surface is marked by a flat groove for tendons of the abductor pollicis longus and the extensor pollicis brevis.

Anatomy of the Radius:

Body
Two extremities

The radius has a body and two extremities. the upper extremity of the radius consists of a partly cylindrical head articulating with the ulna and the humerus, a neck, and a double tuberosity. The body of the radius at the lower extremity is basically quadrilateral in shape, with articular surfaces for the ulna, scaphoid, and lunate bones. The distal end forms the styloid process. It has proximal and distal attachments to the ulna which are called radioulnar articulations.

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