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Forearm/Hand Muscles

Muscles of the forearm and hand

TermDefinition
Supinator Origin: lateral epicondyle of humerus, anterior ulna; Insertion: proximal radius; Action: supinates hand
Pronator Quadratus Origin: distal part of anterior ulna; Insertion: distal radius; Action: pronates hand
Pronator Teres Origin: medial epicondyle of humerus, coronoid process of ulna; Insertion: lateral, middle shaft of radius; Action: pronates hand, flexes forearm
Palmaris Longus Origin: medial epicondyle of humerus; Insertion: palmar aponeurosis; Action: flexes hand
Flexor Carpi Radialis Origin: medial epicondyle of humerus; Insertion: second and third metacarpals; Action: flexes and abducts hand
Flexor Carpi Ulnaris Origin: medial epicondyle of humerus, olecranon process and dorsal order of ulna; Insertion: pisiform, hamate, fifth metacarpal; Action: flexes and adducts hand
Flexor Digitorum Superficialis Origin: medial epicondyle of humerus, proximal ulna, proximal radius; Insertion: middle phalanges of second through fifth digits; Action: flexes proximal and middle phalange, flexes hand
Flexor Digitorum Profundus Origin: anterior, proximal surface of ulna, interosseus membrane; Insertion: distal phalanges of second through fifth digits; Action: flexes phalanges, flexes hand
Flexor Pollicis Longus Origin: anterior portion of radius and interosseus membrane; Insertion: distal phalanx of pollex (thumb); Action: flexes thumb
Flexor Pollicis Brevis Origin: trapezium; Insertion: proximal phalanx of first digit; Action: flexes thumb
Abductor Pollicis Brevis Origin: scaphoid, trapezium; Insertion: proximal phalanx of first digit; Action: abducts thumb
Opponens Pollicis Origin: trapezium; Insertion: first metacarpal; Action: opposes thumb
Abductor Digiti Minimi Origin: pisiform; Insertion: proximal phalanx of fifth digit; Action: abducts fifth digit
Flexor Digiti Minimi Brevis Origin: hamulus of hamate; Insertion: proximal phalanx of fifth digit; Action: flexes fifth digit
Opponens Digiti Minimi Origin: hamulus of hamate; Insertion: fifth metacarpal; Action: opposes fifth digit
Extensor Carpi Radialis Longus Origin: lateral supracondylar ridge of humerus; Insertion: second metacarpal; Action: extends and abducts hand
Extensor Carpi Radialis Brevis Origin: lateral epicondyle of humerus; Insertion: third metacarpal; Action: extends and abducts hand
Extensor Carpi Ulnaris Origin: lateral epicondyle of humerus, proximal ulna; Insertion: fifth metacarpal; Action: extends and adducts hand
Extensor Digitorum Origin: lateral epicondyle of humerus; Insertion: middle and distal phalanges of second through fifth digits; Action: extends phalanges, extends hand
Abductor Pollicis Longus Origin: posterior radius and ulna, interosseous membrane; Insertion: first metacarpal; Action: abducts thumb
Extensor Pollicis Longus and Brevis Origin: posterior radius and ulna, interosseus membrane; Insertion: proximal and distal phalanges of pollex (thumb); Action: extends thumb
Created by: koalas2013