Capsule encloses the radial and coronoid fossae in front and most of the olecranon fossa behind

Distally, it is attached in front to the anterior edge of the coronoid process, anular ligament and olecranon process

This strong and fan shaped ligament (1) arises from the lateral epicondyle

Blends with the annular ligament distally(2).

It is reinforced by origins of the superficial extensors of the forearm and supinator.

Originates from the medial epicondyle

Anterior fibres (2) extend to the coronoid process

Posterior fibres (1) extend to the olecranon process.

Lines the elbow joint capsule, the lower part of the annular ligament and the fossae of the distal humerus.

It is attached to the articular margins of the three bones.

Fatty pads occupy the fossae, between the fibrous and synovial membranes of the capsule.

The synovial membrane extends distally as a pouch within the anular ligament on to the neck of the radius below the ligament.

Continuous with that of proximal radio-ulna