Muscles of the forearm (origin, insertion, action)

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Dorsal Interossei action

Abduct fingers 2,3 and 4 Assist to flex fingers 2 and 3 Assist to extend fingers 2,3 and 4

Abductor pollicis longus action

Abduct the thumb Extend the thumb abduct the wrist

Abductor digiti minimi action

Abduction of the 5th finger assist in opposition of the 5th dinger toward the thumb

Adductor pollicis action

Adduct the thumb Assist in wrist flexion

Palmar interossei action

Adduct the thumb, and metacarpals 2,4 and 5 Assist to flex the thumb, and fingers 2, 4 &5 at the metacarpals and phalanx

Extensor digitorum action

Extend 2-5 digits assist in wrist extension

Extensor indicis action

Extend the second finger (index) Adduct the second finger may assist to extend the wrist

Extensor pollicis longus and brevis action

Extend the thumb (both between the wrist and the metacarpal and the metacarpal and the phalanx) Abduct the wrist

Extensor carpi ulnaris action

Extend the wrist and adduct the wrist

Extensor carpi radialis (longus and brevis) Action

Extend the wrist, abduct the wrist, flex the wrist

Flexor digiti minimi Brevis action

Flex the fifth finger assist in opposition

Flexor pollicic brevis action

Flex the thumb Assist in opposition

Flexor pollicis longus action

Flex the thumb (at the carpal/metacarpal and the metacarpal/phalanx joint) Assist in wrist flexion

flexor carpi ulnaris action

Flex the wrist Adduct the wrist Assist to flex the elbow

Abductor pollicis brevis innervation

Median

opponens pollicis action

Opposition of the thumb

Dorsal interossei

Origin: Adjacent sides of all metacarpals Insertion: Base of the proximal phalanx of 2,3,4 fingers and the extensor aponeurosis

Palmar interossei

Origin: Base of metacarpals 2,4,5 Insertion: Base of the proximal phalanx of the related fingers and the extensor aponeurosis

Extensor Carpi Radialis Longus

Origin: Distal 1/3 of supracondylar ridge of humerus Insertion: Base of the second metacarpal

Abductor pollicis Brevis

Origin: Flexor retinaculum, trapezium and scaphoid tubercles Insertion: Base of proximal phalanx of thumb

Extensor carpi radialis brevis

Origin: Lateral epicondyle Insertion: Base of the third metacarpal

Abductor Digiti Minimi

Origin: Pisiform and tendon of flexor carpi radialis Insertion: base of proximal phalanx of fifth finger

Abductor pollicis longus

Origin: Posterior surface of radius and ulna and the interosseous membrane Insertion: base of the first metacarpal

Extensor Indicis

Origin: Posterior surface of the distal shaft of the ulna and interosseous membrane. Insertion: Tendon of the extensor digitorum at the second metacarpal.

Extensor Pollicis Brevis

Origin: Posterior surface of the radius and interosseous membrane Insertion: Base of Proximal phalanx of the thumb

Extensor Pollicis Longus

Origin: Posterior surface of ulna and interosseous membrane Insertion: Base of the distal Phalanx of the thumb

Flexor pollicis brevis

Origin: Superficial head- Flexor retinaculum Deep head-Trapezium, trapezoid and capitate Insertion: base of the proximal phalanx of the thumb

Flexor pollicis longus

Origin: anterior surface of radius and interosseous membrane Insertion: Base of distal phalanx of thumb

Adductor Pollici

Origin: capitate, metacarpals 2&3 Insertion: Base of proximal phalanx of thumb

Opponens Pollicis

Origin: flexor retinaculum and tubercle of trapezium Insertion: Entire length of metacarpal 1

Flexor digiti minimi brevis

Origin: hook of hamate and flexor retinaculum Insertion: Base of proximal phalanx of fifth finger, palmar surface

Opponens Digiti Minimi

Origin: hook of hamate and flexor retinaculum Insertion: Shaft of fifth metacarpal

Flexor carpi ulnaris

Origin: humeral head- medial epicondyle, ulnar head- posterior surface of the proximal 2/3 of the ulna Insertion: Pisiform, hook of hamate and base of 5th metacarpal.

Extensor carpi ulnaris

Origin: lateral epicondyle Insertion: Base of the 5th metacarpal

Extensor digitorum

Origin: lateral epicondyle Insertion: Base of the middle and distal phalanges of 2-5

supinator

Origin: lateral epicondyle, radial collateral ligament, annular ligament and supinator crest of ulna Insertion: Anterior lateral surface of proximal 1/3 of radial shaft

Flexor carpi radialis

Origin: medial epicondyle Insertion: base of the second and third metacarpal

Palmaris Longus

Origin: medial epicondyle Insertion: flexor retinaculum and palmar aponeruosis

Pronator quadratus

Origin: medial, anterior surface of the distal ulna Insertion: lateral anterior surface of distal radius

Pronator teres action

Pronate the forearem assist to flex the elbow

Flexor pollicis brevis innervation

Superficial head: Median Deep head: ulnar

Palmar longus action

Tense the palmar fascia flex the wrist may assist to flex the elbow

Abductor Digiti Minimi innervation

Ulnar

Flexor carpi ulnaris innervation

Ulnar nerve

Abductor pollicis brevis action

abduct the thumb assist in opposition

flexor digitorum profundus innervation

first and second digits: median third and fourth digits:ulnar

Flexor digitorum profundus action

flex digits 2-5 assist in flexing the wrist

Flexor digitorum superficialis action

flex the digits 2-5 flex the wrist

flexor carpi radialis action

flex the wrist abduct the wrist may assist in elbow flexion

Opponens Pollicis innervation

median

Pronator teres innervation

median nerve

pronator quadratus innervation

median nerve

opponens digiti minimi

opposition of the fifth finger

Pronator teres

origin: Medial epicondyle Insertion: middle lateral surface of the radius

Flexor digitorum profundus

origin: anterior medial surface of proximal 2/3 of ulna insertion: bases of distal phalanges, palmar surface of digits 2-5

Flexor digitorum superficialis

origin: medial epicondyle, ulnar collateral ligament, coronoid process of the ulna, interosseous membrane and the proximal shaft of radius Insertion: sides of middle phalanges of 2-5

pronator quadratus action

pronate the forearm (in the wrist)

Abductor pollicis longus innervation

radial nerve

Supinator innervation

radial nerve

supinator action

supinate the forearm

Adductor pollicis innervation

ulnar

Flexor Digiti minimi Brevis innervation

ulnar

Opponens Digiti Minimi innervation

ulnar

Dorsal Interossei innervation

ulnar nerve

palmar interossei innervation

ulnar nerve


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