Week 11 Muscles of the Posterior Forearm and Hand

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daaronryan
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227457
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Week 11 Muscles of the Posterior Forearm and Hand
Updated:
2013-07-21 16:02:03
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CCMH RA Week 11
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Muscles of the Posterior Forearm and Hand
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  1. Brachioradialis
    O: Proximal 2/3 of supracondylar ridge of humerus

    F.D:


    I: Lateral surface of distal end of radius

    • A: Weak flexion of the elbow, maximal  in
    • mid-pronation

    N: Radial nerve

    S:

  2. Cubital Fossa
    Borders

    • Superior- Line connecting medial and lateral epicondyles of humerus
    • Medial- Pronator Teres
    • Lateral - Brachioradialis  
    • Floor - Brachailis Muscle 
    • Roof - Bicipital Aponeurosis
    • Contents -Median Nerve , Biceps Brachii
    • tendon , Brachial Artery

  3. Extensor Carpi Radialis Longus ( ECRL)
    O:Lateral supracondylar  ridge of humerus

    FD:

    I: Dorsal aspect of base of 2nd metacarpal

    A: Extend and abduct hand at wrist joint; ECRL active during fist clenching

    N: Radial nerve

    S:
  4. Extensor Carpi Radialis Brevis (ECRB)
    • O:Lateral epicondyle of humerus
    • (common extensor origin)

    F.D:

    I:Dorsal aspect of base of 3rd metacarpal

    A:Extend and abduct hand at wrist joint; ECRL active during fist clenching

    N: Deep branch of Radial nerve

    • S:
  5. Extensor Digitorum
    • O: Lateral epicondyle of humerus
    • (common extensor origin)

    • F.D:
    • I: Extensor expansions of medial four digits

    A:Extend medial 4 digits primarily at MCP joints; secondarily at IP joints

    N: Deep branch of Radial nerve

    S:

  6. Extensor Digiti Minimi
    • O: Lateral epicondyle of humerus
    • (common extensor origin)

    F.D:

    I:Extensor expansion of 5th digit

    A: Extends 5th digit at MCP joint; secondarily at IP joints

    N: Deep branch of Radial nerve

    S:

  7. Extensor Carpi Ulnaris
    • O: Lateral epicondyle of humerus;
    • posterior border of ulna via a shared aponeurosis

    F.D:

    I:Dorsal aspect of base of 5th metacarpal

    A: Extends and adducts hand at wrist (active during fist clenching)

    N: Deep branch of Radial nerve

    S:

  8. Supinator
    • O: Lateral epicondyle of humerus;
    • radial collateral and annular ligament, supinator fossa on the ulna and crest
    • of ulna

    F.D: Inferio-medial


    I: Lateral, posterior and anterior surfaces of proximal 1/3 of radius

    • A: Supinates forearm; rotates radius to turn palm anterior or superior (if elbow
    • flexed)

    N:Deep branch of radial nerve

    S:
  9. Posterior forearm Muscles  Diagram
  10. Carpal Tunnel
    Borders

    Palmer: Flexor retinaculum (transverse carpal ligament) 

    Dorsal: Proximal and distal row of carpals 

    • Contents
    • Median nerve, Tendons of FDS and FDP, 
    • Tendon of FPL 

  11. Thenar Muscles Diagram
  12. Oppenens Pollicis
    O: Flexor retinaculum and tubercles of scaphoid and trapezium

    I:Lateral side of 1st metacarpal

    A:Oppose thumb

    • N:Recurrent branch of median nerve



  13. Abductor Pollicis Brevis
    O:Flexor retinaculum and tubercles of scaphoid and trapezium

    I:Lateral side of base of proximal phalanx of thumb

    A:Abducts thumb; helps oppose it

    N:Recurrent branch of median nerve

  14. Flexor Pollicis Brevis
    O: Flexor retinaculum and tubercles of scaphoid and trapezium

    I: Lateral side of base of proximal phalanx of thumb

    • A: Superficial head – Flexes thumb
    • Deep head – Adducts thumb

    • N:Recurrent branch of median nerve /Deep branch of ulnar nerve


  15. Adductor Pollicis
    • O: Oblique head – base of 2nd and 3rd metacarpals, capitate and adjacent carpals
    • Transverse head – anterior surface of shaft of 3rd metacarpal

    I:Medial side of base of proximal phalanx of thumb

    A:  Adducts thumb toward lateral border of palm

    N:Deep branch of ulnar nerve

  16. Abductor Digiti Minimi
    O: Pisiform

    I:Medial side of base of proximal phalanx of 5th digit

    A:Abducts 5th digit; assists in flexion of it’s PIP

    • N:Deep branch of ulnar nerve

  17. Flexor Digiti Mini Brevis
    O:Hook of hamate and flexor retinaculum

    I:Medial side of base of proximal phalanx of 5th digit

    A:Flexes proximal phalanx of 5th digit

    N:Deep branch of ulnar nerve

  18. Opponens Digiti Minimi
    O: Hook of hamate and flexor retinaculum

    I: Medial border of 5th metacarpal

    A:Draws 5th metacarpal anterior and rotates it, bringing 5th digit into opposition to thumb

    N:Deep branch of ulnar nerve

  19. Palmaris Brevis
    O: Medial border of the palmer aponeurosis

    F.D: Medial

    I: Skin on medial border of hand

    • A: Wrinkles the skin of the hypothenar
    • eminence

    S:Protects the ulnar nerve and artery

    • N:Ulnar nerve
  20. Lumbricals  1 & 2
    O: Lateral two tendons of flexor digitorum profundus (as unipennate muscles)

    F.D:

    I: Lateral sides of extensor expansions of 2nd to 5th digits

    A: Flex MCP joints; extend IP joints of 2nd to 5th digits

    N: Median nerve

    S:

  21. Lumbricals 3 & 4
    O:Medial three tendons of flexor digitorum profundus (as bipennate muscles)

    • F.D:
    •  
    • I: Lateral sides of extensor expansions of 2nd to 5th digits

    A: Flex MCP joints; extend IP joints of 2nd to 5th digits

    N: Deep branch of Ulnar nerve

    S:

  22. Palmer Interossei 1st - 3rd
    O:Palmar surfaces of 2nd, 4th and 5th metacarpals (as unipennate muscles)

    F.D:

    I: Bases of proximal phalanges; extensor expansions of 2nd, 4th and 5th digits

    A: Adducts 2nd, 4th and 5th digits toward axial line; assist lumbricals in flexing MCP joints and extending IP joints

    N:Deep branch of Ulnar nerve

    • S:
  23. Dorsal Interossei  1st-4th
    O: Adjacent sides of two metacarpals (as bipennate muscles)

    F.D:

    I: Bases of proximal phalanges; extensor expansions of 2nd – 4th digits

    A: Abducts 2nd – 4th digits from axial line; act with lumbricals in flexing MCP joints and extending IP joints.

    N:Deep branch of ulnar nerve

    S:

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