Posterior muscles of forearm

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Author:
mfawcett
ID:
125430
Filename:
Posterior muscles of forearm
Updated:
2011-12-31 08:01:36
Tags:
posterior muscle muscles forearm anatomy
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Description:
Origins, insertions, actions and nerve supply of muscles of the posterior compartment of the forearm
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  1. Brachioradialis
    • - Upper 2/3 of lateral supracondylar ridge
    • --> Radial styloid process
    • - Radial nerve
    • - Flexes forearm midway between pronation and supination
  2. Extensor carpi radialis longus
    • - Lateral supracondylar ridge
    • --> Base of dorsal aspect of 2nd metacarpal
    • - Radial nerve
    • - Extend and abduct wrist
  3. Extensor carpi radialis brevis
    • - CEO
    • --> Base of dorsal aspect of 3rd metacarpal
    • - Posterior interosseous nerve
    • - Extends and abducts wrist
  4. Extensor digitorum communis
    • - CEO
    • --> forms 4 tendons that form the dorsal expansions of the fingers - central part goes to the distal phalanx
    • - Posterior interosseous nerve
    • - Extends fingers, extends wrist
  5. Extensor digiti minimi
    • - CEO
    • --> medial aspect of dorsal expansion of little finger
    • - Posterior interosseous nerve
    • - Extends little finger
  6. Extensor carpi ulnaris
    • - CEO and subcutaneous border of ulna
    • --> Base of 5th metacarpal
    • - Posterior interosseous nerve
    • - Extends or adducts wrist
  7. Supinator
    • - Supinator crest of ulna, area just distal to radial notch, - Oblique superficial fibres - posterior aspect of lateral epicondyle, lateral and anular ligaments
    • --> Lateral aspect of proximal shaft of radius
    • - Posterior interosseous nerve
    • - Supinates radius esp when elbow is extended
  8. Abductor pollicis longus
    • - Proximal part of posterior ulna, interosseous membrane, mid-portion of radius
    • --> lateral aspect of base of thumb metacarpal
    • - Posterior inteosseous nerve
    • - Extends thumb, abducts wrist
  9. Extensor pollicis brevis
    • - Posterior radius distal to AbPL and interosseous membrane
    • --> base of proximal phalanx of thumb
    • - Posterior interosseous nerve
    • - Extends thumb at carpometacarpal joint
  10. Extensor pollicis longus
    tendon goes?
    • - Dorsum of ulna distal to AbPL, interosseous membrane
    • --> Base of distal phalanx of thumb
    • - Tendon goes around Lister's tubercle
    • - Posterior interosseous nerve
    • - Extends metacarpophalangeal and interphalanageal joints of thumb, weak extensor of wrist
  11. Extensor indicis
    • - Posterior aspect of ulna and interosseous membrane, distal to thumb extensors
    • --> Medial side of dorsal expansion of index finger
    • - Posterior interosseous nerve
    • - Extends index finger

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