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Arm and Elbow Joint

OVERVIEW
• The elbow serves to position the hand in space.
• The muscles acting here are often denervated in brachial plexus and proximal peripheral nerve injury patterns.
• With dysfunction at the elbow, the upper extremity cannot be properly positioned in space to perform normal functions even if normal hand or other distal function is preserved.
• Restoration of elbow movement must be a priority in peripheral nerve injury patients.
Structures of the Elbow
• Bones:
• Humerus
• Radius
• Ulna
• The elbow joint is a hinge joint.
Movements of the Elbow
• Flexion and extension are movements about a coronal axis.
Muscles of the Elbow (with detailed examination links)

Muscle Name

Innervation

Basic Action

Biceps brachii

Musculocutaneous nerve

Elbow flexion, forearm supination.

Brachialis

Musculocutaneous nerve

Elbow flexion.

Brachioradialis

Radial nerve

Can assist in elbow flexion (with forearm in neutral position).

Triceps brachii

Radial nerve

Elbow extension.

Anconeus

Radial nerve

Elbow extension.

Extensor carpi radialis longus

Radial nerve

Extends the wrist (weak assistance in elbow flexion).

Pronator teres

Median nerve

Pronates the forearm (weak assistance in elbow flexion).

Italics -- Muscles that assist or may assist but are not the primary action of elbow joint flexion and extension. These include muscles that cross the elbow joint.