Muscles Origin, Insertion, Action, Innervation

Abductor Digiti Minimi Action

Abduct fifth finger Assist in opposition of the fifth finger toward the thumb

Dorsal Interossei Action

Abduct the second, third, and fourth fingers at the metacarpophalangeal joints Assist to flex the second, third and fourth fingers Assist to extend the second, third, and fourth fingers at the interphalangeal joints

Abductor pollicis longus Action

Abduct the thumb Extend the thumb Abduct the wrist

Abductor Pollicis Brevis Action

Abduct thumb Assist in opposition of the thumb

Adductor Pollicis Action

Adduct the thumb Assist to flex the thumb

Palmar interossei Action

Adduct the thumb, second, fourth and fifth fingers toward the third finger Assist to flex the thumb, second fourth and fifth fingers Assist to extend the thumb, second, fourth and fifth fingers at the interphalangeal joints

Dorsal Interossei Origin

Adjacent sides of all metapcarpals

Flexor Digitorum Profundus Origin

Anterior and middle surfaces of proximal 3/4 of ulna

Supinator Insertion

Anterior, lateral surface of proximal 1/3 of radial shaft

Extensor Pollicis Longus Insertion

Base of distal phalanx of thumb

Extensor Carpi Ulnaris Insertion

Base of fifth metacarpal

Abductor pollicis longus Insertion

Base of first metacarpal

Palmar interossei Origin

Base of first, second, fourth, and fifth metacarpals

Extensor Digitorum Insertion

Base of middle and distal phalanges of second-fifth fingers

Abductor Digiti Minimi Insertion

Base of proximal phalanx of fifth finger, ulnar surface

Dorsal Interossei Insertion

Base of proximal phalanx of the second, third, and fourth fingers at the extensor aponeurosis

Abductor Pollicis Brevis Insertion

Base of proximal phalanx of the thumb

Adductor Pollicis Insertion

Base of proximal phalanx of thumb

Extensor pollicis Brevis Insertion

Base of proximal phalanx of thumb

Flexor Pollicis Brevis Insertion

Base of proximal phalanx of thumb

Flexor Carpi Radialis Insertion

Base of second and third metacarpals

Palmar interossei Insertion

Base of the proximal phalanx of the related finger and the extensor aponeurosis

Extensor Carpi Radialis Brevis Insertion

Base of third metacarpal

Flexor Digitorum Profundus Insertion

Bases of distal phalanges, palmar surface of second through fifth fingers

Adductor Pollicis Origin

Capitate, second and third metacarpals

Extensor Carpi Radialis Brevis Origin

Common extensor tendon from the later epicondyle of humerus

Extensor Digitorum Origin

Common extensor tendon from the lateral epicondyle of the humerus

Pronator Teres Origin

Common flexor tendon from medial epicondyle of humerus Coronoid process of the ulna

Palmaris Longus Origin

Common flexor tendon from the medial epicondyle of the humerus

Extensor Carpi Ulnaris Origin

Common lateral tendon from the lateral epicondyle of the humerus

Opponen Pollicis Insertion

Entire length of first metacarpal bone, radial surface

Extensor Digitorum Action

Extend second- fifth fingers Assist to extend the wrist

Anconeus Action

Extend the elbow

Extensor Indicis Action

Extend the second finger Adduct the second finger May assist to extend the wrist

Lumbricals of the hand Action

Extend the second through fifth fingers at the interphalangeal joints

Extensor pollicis Brevis Action

Extend the thumb Abduct the wrist

Extensor Pollicis Longus Action

Extend the thumb (both) Abduct the wrist

Extensor Carpi Radialis Brevis Action

Extend the wrist Abduct the wrist Assist to flex the elbow

Extensor Carpi Ulnaris Action

Extend the wrist Adduct the wrist

Lumbricals of the hand Insertion

Extensor aponeurosis on dorsal surface of phalanges

Flexor Digitorum Profundus Action

Flex the second through fifth fingers Assist to flex the wrist

Flexor Digitorum Superficialis Action

Flex the second through fifth fingers Flex the wrist

Flexor Pollicis Brevis Action

Flex the thumb Assist in opposition of the thumb

Flexor Carpi Radialis Action

Flex the wrist Abduct the wrist May assist to flex the elbow

Flexor Carpi Ulnaris Action

Flex the wrist Adduct the wrist Assist to flex the elbow

Opponen Pollicis Origin

Flexor Retinaculum and tubercle of the trapezium

Palmaris Longus Insertion

Flexor retinaculum and palmar aponeurosis

Abductor Pollicis Brevis Origin

Flexor retinaculum, trapezium and scaphoid tubercle

Flexor Carpi Ulnaris Origin

Humeral Head: common flexor tendon from medial epicondyle of humerus Ulnar head: posterior surface of the proximal two thirds of ulna

Anconeus Origin

Lateral epicondyle of the humerus

Supinator Origin

Lateral epicondyle of the humerus Radial collateral ligament Annular ligament Supinator crest of the ulna

Pronator Quadratus Insertion

Lateral, anterior surface of distal radius

Pronator Quadratus Origin

Medial, anterior surface of distal ulna

Abductor Pollicis Brevis Innervation

Median

Flexor Carpi Radialis Innervation

Median

Flexor Digitorum Superficialis Innervation

Median

Opponen Pollicis Innervation

Median

Palmaris Longus Innervation

Median

Pronator Quadratus Innervation

Median

Pronator Teres Innervation

Median

Pronator Teres Insertion

Middle and lateral surface of the radius

Anconeus Insertion

Olecranon process and posterior proximal surface of the ulna

Opponens Pollicis Action

Opposition of the thumb

Flexor Carpi Ulnaris Insertion

Pisiform Hook of the hamate Base of fifth metacarpal

Abductor Digiti Minimi Origin

Pisiform and tendon of the flexor carpi ulnaris

Extensor pollicis Brevis Origin

Posterior surface of radius and interosseous membrane

Abductor pollicis longus Origin

Posterior surface of radius and ulna, and interosseous membrane

Extensor Indicis Origin

Posterior surface of the distal shaft of ulna and interosseous membrane

Extensor Pollicis Longus Origin

Posterior surface of the ulna and interosseous membrane

Pronator Quadratus Action

Pronate the forearm

Pronator Teres Action

Pronate the forearm Assist to flex the elbow

Abductor pollicis longus Innervation

Radial

Anconeus Innervation

Radial

Extensor Carpi Radialis Brevis Innervation

Radial

Extensor Carpi Ulnaris Innervation

Radial

Extensor Digitorum Innervation

Radial

Extensor Pollicis Longus Innervation

Radial

Extensor pollicis Brevis Innervation

Radial

Supinator Innervation

Radial

Lumbricals of the hand Innervation

Second and third fingers - Median Fourth and fifth fingers- ulnar

Flexor Digitorum Profundus Innervation

Second and third: Median Fourth and fifth: Ulnar

Flexor Digitorum Superficialis Insertion

Sides of middle phalanges of second through fifth fingers

Flexor Pollicis Brevis Innervation

Superficial Head: Median Deep head: Ulnar

Flexor Pollicis Brevis Origin

Superficial Head: flexor retinaculum Deep Head: Trapezium, Trapezoid, and capitate

Supinator Action

Supinate the forearm

Lumbricals of the hand Origin

Surfaces of the flexor digitorum profundus tendons

Extensor Indicis Insertion

Tendon of the extensor digitorum at the level of the second metacarpal

Palmaris Longus Action

Tense the palmar fascia Flex wrist May assist to flex elbow

Abductor Digiti Minimi Innervation

Ulnar

Adductor Pollicis Innervation

Ulnar

Dorsal Interossei Innervation

Ulnar

Flexor Carpi Ulnaris Innervation

Ulnar

Palmar interossei Innervation

Ulnar

Flexor Digitorum Superficialis Origin

common flexor tendon from medial epicondyle of humerus, ulnar collateral ligament, coronoid process of ulna, interosseous membrane and proximal shaft of radius

Flexor Carpi Radialis Origin

common flexor tendon from medial epicondyle of the humerus