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Muscles of the Wrist and Hand

Muscles of the Wrist and Hand. Chapter 7. Flexor carpi radialis. Location: Palmar Origin: which epidcondyle? Insertion: 2nd and 3rd metacarpals (radius side) Actions: flexion of the wrist abduction of the wrist (weak elbow flexion) (weak pronation of the forearm).

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Muscles of the Wrist and Hand

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  1. Muscles of the Wrist and Hand • Chapter 7

  2. Flexor carpi radialis • Location: Palmar • Origin: • which epidcondyle? • Insertion: 2nd and 3rd metacarpals • (radius side) • Actions: • flexion of the wrist • abduction of the wrist • (weak elbow flexion) • (weak pronation of the forearm)

  3. Flexor carpi ulnaris • Location: Palmar • Origin: • which epidcondyle? • Insertion: 5th metacarpal • (ulna side) • Actions: • flexion of the wrist • adduction of the wrist • (weak elbow flexion)

  4. Palmaris longus • Location: Palmar • Origin: • Insertion: plamar aponeurosis • (to neither side) • Action: • flexion of the wrist • Why only flexion of the wrist? • (weak flexion of the elbow)

  5. Flexor digitorum superficialis • Location: Palmar • Origin: • Insertion: split tendons attach to the sides of the middle phalanx of the four fingers • Actions: • flexion of fingers and wrist • (weak elbow flexion)

  6. Flexor digitorum profundus • Location: Palmar • Origin: proximal surface of ulna • Insertion: split tendons attach to distal phalanx of the four fingers • Actions: flexion of fingers and wrist

  7. Flexor pollicus longus • Location: Palmar • Origin: middle anterior surface of the radius • Insertion: base of the distal phalanx of the thumb (palmar surface) • Actions: • flexion of wrist and thumb • abduction of the wrist

  8. Review • What do all the ‘flexor’ muscles have in common? • What do the following muscles have in common? • Flexor carpi radialis • Flexor carpi ulnaris • Palmaris • Flexor digitorum superficialis

  9. Extensor Carpi Radialis Longus • Location: dorsal • Origin: lateral epicondyle • Insertion: base of 2nd metacarpal • Actions: • Extension of the wrist • Abduction of the wrist • weak elbow flexion • weak elbow pronation

  10. Extensor carpi radialis brevis • Location: dorsal • Origin: lateral epicondyle • Insertion: base of 3rd metacarpal • Actions: • Extension of the wrist • Abduction of the wrist • weak elbow flexion

  11. Extensor carpi ulnaris • Location: Dorsal • Origin: lateral epicondyle of the humerus • Insertion: 5th metacarpal • Actions: • extension of the wrist • adduction of the wrist • weak elbow extension

  12. Extensor digitorum • Location: Dorsal • Origin: lateral epicondyle of the humerus • Insertion: middle and distal phalanges of the four fingers • Actions: • extension of the fingers • extension of the wrist • weak extension of the elbow

  13. Extensor indicis • Location: Dorsal • Origin: distal ulna • Insertion: base of middle and distal 2nd phalange • Actions: • extension of the 2nd phalange • weak wrist extension • weak supination

  14. Extensor digiti minimi • Location: Dorsal • Origin: lateral epicondyle of the humerus • Insertion: base of middle & distal 5th phalange • Actions: • extension of the 5th phalange • weak wrist extension • weak elbow extension

  15. Extensor pollicus longus • Location: Dorsal • Origin: distal ulna • Insertion: base of the distal phalanx of the thumb (dorsal side) • Actions: • extension of the wrist • extension of the thumb • abduction of the wrist • weak supination • “anatomical snuff box” / scaphoid

  16. Location: Dorsal Origin: distal radius Insertion: base of the proximal phalanx of the thumb (dorsal side) Actions: extension of the thumb abduction of the wrist weak extension of the wrist Extensor pollicus brevis

  17. Location: Dorsal Origin: midshaft of ulna & radius Insertion: base of the 1st metacarpal Actions: abduction of the thumb abduction of the wrist extension of the thumb weak extension of the wrist weak supination Abductor pollicis longus

  18. Review • What do all the extensor muscles have in common? • What do the following muscles have in common? • Extensor carpi radialis • Extensor carpi ulnaris • Extensor digitorum

  19. Review • What do the following pairs of muscles have in common besides their actions • Flexor carpi radialis and extensor carpi radialis • Flexor carpi ulnaris and extensor carpi ulnaris

  20. Intrinsic Muscles • Thenar eminence • Hypothenar eminence

  21. Nerves • Median nerve • Radial side, anterior hand • Ulnar • Ulnar side, anterior hand (“funny bone”) • Radial • Posterior hand

  22. Nerves

  23. Carpal Tunnel • The “tunnel” • Carpal bones • Flexor retinaculum (transverse ligament) • Flexor tendons (except FCU and Palmaris Longus) and median nerve • Repetition and overuse • Swelling and inflammation

  24. Arteries • Radial • Ulnar

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