Joints of the Skeletal System
Which parts help keep together the articulating surfaces of the
What factors allow an especially wide range of motion in the
Which structures form the hinge joint of the elbow?
Which parts of the elbow permit pronation and supination of the
The synovial membrane that forms the inner lining of the
elbow capsule projects into the joint cavity between the radius
and ulna and partially divides the joint into humerus–ulnar
and humerus–radial portions. Also, varying amounts of adi-
pose tissue form fatty pads between the synovial membrane
and the F brous layer of the joint capsule. These pads help pro-
tect nonarticular bony areas during joint movements.
The only movements that can occur at the elbow
between the humerus and ulna are hinge-type movements—
ﬂ exion and extension. The head of the radius, however, is
free to rotate in the anular ligament. This movement allows
pronation and supination of the hand.
Elbow joint. (
) The elbow joint allows hinge movements, as well as pronation and supination of the hand. (
) Photograph of the
elbow joint (sagittal section).
Tendon of biceps
Ulnar collateral ligament
Radial collateral ligament
Ligaments associated with the elbow joint. (
) The ulnar collateral ligament, medial view, and (
) the radial collateral ligament
strengthen the capsular wall of the elbow joint, lateral view.