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Anterior Compartment of Arm Posterior Compartment of Arm Flexors Insertions on the bones of the forearm Extensors Insertions on the bones of the forearm Musculocutaneous nerve Radial nerve Biceps brachii Triceps brachii Brachialis Anconeus Brachioradialis * (radial nerve) [Coracobrachialis – found in anterior compartment but because it has its origin on the scapula and insertion on the humerus, it causes movement at the shoulder joint instead of the elbow] Anterior Compartment of Forearm Posterior Compartment of Forearm Flexors and Pronators Insertions usually on bones of wrist and hand Origin tends to be medial epicondyle of humerus Extensors, a supinator and an abductor Insertions usually on bones of wrist and hand Origin tends to be lateral epicondyle of humerus Median nerve Radial nerve Flexor digitorum superficialis (S) [Brachioradialis- functionally this is a muscle of Flexor carpi radialis (S) the anterior compartment compartment of arm] Pronator teres (S) Extensor carpi radialis longus (S) Palmeris longus (S) Extensor carpi radialis brevis (S) Flexor carpi ulnaris * (ulnar nerve) (S) Extensor digitorum (S) Flexor pollicis longus (D) Extensor carpi ulnaris (S) Pronator quadratus (D) Supinator (D) Flexor digitorum profundus * (ulnar/median) (D) Extensor pollicis longus (D) Extensor pollicis brevis (D) * indicates unusual innervation Extensor indicis (D) (S) =superficial Abductor pollicis longus (D) (D)=deep