On the radial shaft just below the head is a process called
It is an attachment for a muscle (biceps
brachii) that bends the upper limb at the elbow. At the distal
end of the radius, a lateral
attachments for ligaments of the wrist.
is longer than the radius and overlaps the end of
the humerus posteriorly. At its proximal end, the ulna has a
located on the thumb side of the forearm, is some-
what shorter than its companion, the ulna
radius extends from the elbow to the wrist and crosses over the
ulna when the hand is turned so that the palm faces backward.
A thick, disclike
at the upper end of the radius
articulates with the capitulum of the humerus and a notch of
the ulna (radial notch). This arrangement allows the radius
Head of radius
Neck of radius
Hand (palm anterior)
Hand (palm posterior)
Right upper limb. (
) Anterior view with the hand, palm anterior and (
) with the hand, palm posterior. (
) Posterior view of the right
) Radiograph of the right elbow and forearm, anterior view.