Muscles of the forearm (origin, insertion, action)
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
