Structures

  • Extensor carpi radialis longus
  • Extensor carpi radialis brevis
  • Extensor digitorum
  • Extensor digiti minimi
  • Extensor carpi ulnaris
  • Extensor pollicis brevis
  • Extensor pollicis longus
  • Extensor indicis
MuscleActionOriginInsertionInnervationBlood supply
Extensor carpi radialis longus- Extends and abducts wrist- Lateral supracondylar ridge of humerus- Base of 2nd metacarpal- Radial nerve: C6,7- Radial artery
Extensor carpi radialis brevis- Extends and abducts wrist- Lateral epicondyle of humerus- Base of 3rd metacarpal- Radial nerve: C7,8- Radial artery
Extensor digitorum- Extends digits 2-5
- Extends wrist
- Lateral epicondyle of humerus- Extensor expansions of medial four digits- Posterior interosseous nerve: C7,8- recurrent and Posterior interosseous arteries
Extensor digiti minimi- Extends 5th digit
- Weak wrist extension
- Lateral epicondyle humerus- Extensor expansion of 5th digit at metacarpophalangeal and interphalangeal joints- Posterior interosseous nerve: C7,8- recurrent interosseous artery
Extensor carpi ulnaris- Extends and adducts wrist- Lateral epicondyle of humerus
- Posterior border of ulna
- Base of 5th metacarpal- Posterior interosseous nerve: C7,8- Ulnar artery
Extensor pollicis brevis- Extends proximal phalanx of thumb at carpometacarpal joint
- Weak wrist extension
- posterior surface of radius and interosseous membrane- Base of proximal phalanx of thumb- Posterior interosseous nerve: C7,8- Posterior interosseous artery
Extensor pollicis longus- Extends distal phalanx of thumb at carpometacarpal and interphalangeal joints
- Weak wrist extension
- Posterior surface of middle 1/3 of ulna and interosseous membrane- Base of distal phalanx of thumb- Posterior interosseous nerve: C7,8- Posterior interosseous artery
Extensor indicis- Extends 2nd digit
- Weak wrist extension
-posterior surface of ulna and interosseous membrane- Extensor expansion of 2nd digit- Posterior interosseous nerve: C7,8- Posterior interosseous artery
Extensor indicis- Extends 2nd digit
- Weak wrist extension
-posterior surface of ulna and interosseous membrane- Extensor expansion of 2nd digit- Posterior interosseous nerve: C7,8- Posterior interosseous artery