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In humans, the main task of the elbow is to properly place the hand in space by shortening and lengthening the upper limb. While the superior radioulnar joint shares joint capsule with the elbow joint, it plays no functional role at the elbow. [7] With the elbow extended, the long axis of the humerus and that of the ulna coincide. [20]
Each capsule consists of two layers or membranes: an outer (fibrous membrane, fibrous stratum) composed of avascular white fibrous tissue; an inner (synovial membrane, synovial stratum) which is a secreting layer; On the inside of the capsule, articular cartilage covers the end surfaces of the bones that articulate within that joint.
It helps to stabilise the proximal radial head, [6] and the radioulnar joint. [7] Superiorly, the ligament is supported by attachments to the radial collateral ligament and the fibrous capsule of the elbow joint. Inferiorly, a few fibres attached to the neck of the radius support a fold of the synovial membrane without interfering with the ...
The joint capsule of the elbow attaches to the humerus just proximal to the olecranon fossa. [3] [4] ... Elbow joint. Deep dissection. Posterior view. Elbow joint ...
Its role in elbow extension is trivial in humans. It assists in extension of the elbow, where the triceps brachii is the principal agonist, and supports the elbow in full extension. [7] It also prevents the elbow joint capsule being pinched in the olecranon fossa during extension of the elbow. Anconeus also abducts the ulna and stabilizes the ...
The joint capsule of the elbow attaches to the humerus just proximal to the radial fossa. [1] [2] Additional images. Radial fossa. Human arm bones diagram. Elbow ...