O/I on the Radius and Ulna

Insertion: Tuberosity and coronoid process of ulna

Brachialis

Origin: Proximal 2/3 of lateral supracondylar ridge of humerus

Brachioradialis

Origin: Distal 1/3 of lateral supracondylar ridge of humerus

Extensor Carpi Radialis Longus

Insertion: Olecranon process and posterior, proximal ulna

Anconeus

Origin: Posterior surface of distal shaft of ulna and interosseus membrane

Extensor Indicis

Origin: Common flexor tendon and posterior, proximal 2/3 of ulna

Flexor Carpi Ulnaris

Origin: Common flexor tendon, UCL, coronoid process, interosseus membrane, proximal shaft of radius

Flexor Digitorum Superficialis

Origin: Anterior and medial proximal ¾ of ulna

Flexor Digitorum Profundus

Origin: Common flexor tendon and coronoid process of ulna

Pronator Teres (O)

Insertion: Middle of lateral surface of radius

Pronator Teres (I)

Origin: Anterior, medial surface of distal ulna

Pronator Quadratus (O)

Insertion: Lateral, anterior surface of distal radius

Pronator Quadratus (I)

Origin: Lateral epicondyle of humerus, RCL, annular ligament, supinator crest of ulna

Supinator (O)

Insertion: Anterior, lateral surface of proximal 1/3 of radial shaft

Supinator (I)