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Glossary of Anatomy Muscles 350-375

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Flexor Pollicis Brevis action
Flexes thumb (at carpometacarpal and metacarpophalangeal joints)
Flexor Pollicis Brevis innervation
Median (or Ulnar) nerve
Thenar origin and insertion
origin: Origin; insertion: Insertion
Abductor Pollicis Brevis action
Abducts thumb (at carpometacarpal joint)
Abductor Pollicis Brevis innervation
Median nerve
Extensor Indicis origin and insertion
origin: Posterior surface of distal ulna; interosseous membrane; insertion: Extensor expansion of index finger; joins tendon of extensor digitorum
Thenar action
Action
Thenar innervation
Nerve
Extensor Pollicis Longus origin and insertion
origin: Dorsal shaft of radius and ulna; interosseous membrane; insertion: Base of distal phalanx of thumb
Extensor Indicis action
Extends index finger
Extensor Indicis innervation
Posterior interosseous nerve
Extensor Pollicis Brevis origin and insertion
origin: Dorsal shaft of radius and ulna; interosseous membrane; insertion: Base of proximal phalanx of thumb
Extensor Pollicis Longus action
Extends thumb
Extensor Pollicis Longus innervation
Posterior interosseous nerve
Abductor Pollicis Longus origin and insertion
origin: Posterior surface of radius and ulna; interosseous membrane; insertion: Base of first metacarpal
Extensor Pollicis Brevis action
Extends thumb
Extensor Pollicis Brevis innervation
Posterior interosseous nerve
Supinator origin and insertion
origin: Lateral epicondyle of humerus; proximal ulna; insertion: Proximal end of radius
Abductor Pollicis Longus action
Abducts and extends thumb
Abductor Pollicis Longus innervation
Posterior interosseous nerve (branch of radial nerve)
Deep origin and insertion
origin: Origin; insertion: Insertion
Supinator action
Assists biceps brachii to supinate forearm; antagonist of pronator muscles
Supinator innervation
Radial nerve
Extensor Carpi Ulnaris origin and insertion
origin: Lateral epicondyle of humerus and posterior border of ulna; insertion: Base of fifth metacarpal
Deep action
Action

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