Posterior forearm-superficial muscles

• Brachioradialis origin

  ridge superior to lateral epicondyle
• brachioradialis insertion

  styloid process of radius
• brachioradialis action

  flex at elbow
• extensor Carpi radialis longus origin

  supracondylar ridge of humerus
• extensor carpi radialis longus insertion

  metacarpal 2
• extensor Carpi radialis longus action

  extend and abduct at wrist
• extensor Carpi radialis brevis origin

  lateral epicondyle
• extensor Carpi radialis brevis insertion

  metacarpal 3
• extensor Carpi radialis brevis action


  extend and abduct at wrsit
• innervation of brachioradialis, carpi radialis brevis and longus

  radial nerve
• extensor digitorum origin

  lateral epicondyle
• extensor digitorum insertion

  posterior surfaces of phalanges on digits 2-5
• extensor digitorum action

  extend digits 2-5 and wrist
• extensor digiti minimi origin

  lateral epicondyle
• extensor digiti minimi insertion

  proximal phalanx of digit 5
• extensor digiti minimi action


  extend digit 5 and wrist
• extensor Carpi ulnaris origin

  lateral epicondyle and posterior ulna
• extensor Carpi ulnaris insertion

  metacarpal 4
• extensor Carpi ulnaris action

  extend and adduct at wrist
• innervation of extensor digitorum, digiti minimi, Carpi ulnaris

  deep radial nerve