Radioulnar Muscles

biceps brachii

Origin: SH: coracoid process of scapula, LH: supraglenoid tubercle

Insertion: radial tuberosity and bicepital aponeurosis

Innervation: musculocutaneous

Action: Elbow flexion

brachialis

Origin: Anterior distal surface of humerus

Insertion: ulnar tuberosity of coronoid process

Innervation: musculocutaneus

Action: Elbow flexion

brachioradialis

Origin: Lateral supracondylar ridge of humerus

Insertion: Styloid process of radius

Innervation: radial

Action: Elbow flexion, Radial supination & pronation

triceps brachii

Origin: Long Hd: infraglenoid tubercle, Lateral Hd: superior lateral surface of humerus, Medial Hd: posterior distal surface of humerus

Insertion: Olecranon process of ulna

Innervation: Radial

Action: Elbow extension

anconeus

Origin: Lateral epicondyle of humerus

Insertion: Lateral surface of olecranon process

Innervation: Radial

Action: Stabilization at elbow, Elbow extension

biceps brachii

Origin: SH: coracoid process, LH: supraglenoid tubercle

Insertion: Radial tuberosity

Innervation: Musculocutaneous

Action: Supination

supinator

Origin: Lateral epicondyle of humerus and ulna

Insertion: Anterolateral surface of radius

Innervation: Deep radial

Action: Supination

pronator teres

Origin: Medial epicondyle of humerus & coronoid process of ulna

Insertion: Distal lateral surface of radius

Innervation: Median

Action: Pronation

pronator quadratus

Origin: Medial surface of distal ulna

Insertion: Anterolateral surface of distal radius

Innervation: Median

Action: Pronation