Upper Extremity-Forearm and Hand

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Author:
ae_228
ID:
280071
Filename:
Upper Extremity-Forearm and Hand
Updated:
2014-08-01 18:54:26
Tags:
anatomy muscles forearm hand
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Description:
Muscles of forearm and hand
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  1. Brachialis-Action
    Flex the elbow (humeroulnar joint)
  2. Brachialis-Origin
    Distal Half of anterior surface of humerus
  3. Brachialis-Insertion
    Tuberosity and coronoid process of ulna
  4. Brachialis-Innervation
    Musculocutaneous, small branch from radial C5, 6
  5. Brachioradialis-Action
    Flex the elbow (humeroulnar joint)

    Assist to pronate and supinate the forearm when these movements are resisted
  6. Brachioradialis-Origin
    Proximal two-thirds of the lateral supracondylar ridge of humerus
  7. Brachioradialis-Insertion
    Styloid process of radius
  8. Brachioradialis-Innervation
    Radial C5, 6
  9. Extensor Carpi Radialis Longus and Brevis-Action
    • Extend the wrist (radiocarpal joint)
    • Abduct the wrist (r/c joint)
    • Assist to flex the elbow (humerulnar joint)
  10. Extensor Carpi Radialis Longus and Brevis-Origin
    • Longus:
    •   *Distal one-third of the lateral supracondylar ridge of the humerus
    • Brevis:
    •   *Common extensor tendon from the lateral epicondyle of humerus
  11. Extensor Carpi Radialis Longus and Brevis-Insertion
    • Longus:
    •   *base of 2nd metacarpal
    • Brevis:
    •   *base of 3rd metacarpal
  12. Extensor Carpi Radialis Longus and Brevis-Innervation
    • Longus: Radial C5, 6, 7, 8
    • Brevis: Radial C6, 7, 8
  13. Extensor Carpi Ulnaris-Action
    • Extend the wrist (radiocarpal joint)
    • Adduct the wrist (r/c joint)
  14. Extensor Carpi Ulnaris-Origin
    Common extensor tendon from the lateral epicondyle of humerus
  15. Extensor Carpi Ulnaris-Insertion
    Base of 5th metacarpal
  16. Extensor Carpi Ulnaris-Innervation
    Radial C6, 7, 8
  17. Extensor Digitorum-Action
    • Extend the 2nd-5th fingers (metacarpophalangeal and interphalangeal joints)
    • Assist to extend the wrist (radiocarpal joint)
  18. Extensor Digitorum-Origin
    common extensor tendon from the lateral epicondyle of humerus
  19. Extensor Digitorum-Insertion
    bases of middle and distal phalanges of 2nd-5th fingers
  20. Extensor Digitorum-Innervation
    Radial C6, 7, 8
  21. Anconeus-Action
    Extend the elbow (humeroulnar joint)
  22. Anconeus-Origin
    lateral epicondyle of the humerus
  23. Anconeus-Insertion
    Olecranon process and posterior, proximal surface of ulna
  24. Anconeus-Innervation
    Radial C7, 8
  25. Extensor Indicis-Action
    • Extend the 2nd finger (metacarpophalangeal joint)
    • Adduct the 2nd finger
    • May assist to extend the wrist (radiocarpal joint)
  26. Extensor Indicis-Origin
    Posterior surface of distal shaft of ulna and interosseous membrane
  27. Extensor Indicis-Insertion
    Tendon of the extensor digitorum at the level of the 2nd metacarpal
  28. Extensor Indicis-Innervation
    Radial C6, 7, 8
  29. Flexor Carpi Radialis-Action
    • Flex the wrist (radiocarpal joint)
    • Abduct the wrist (radiocarpal joint)
    • May assist to flex the elbow (humeroulnar joint)
  30. Flexor Carpi Radialis-Origin
    Common flexor tendon from medial epicondyle of humerus
  31. Flexor Carpi Radialis-Insertion
    Bases of 2nd and 3rd metacarpals
  32. Flexor Carpi Radialis-Innervation
    Median C6, 7, 8
  33. Palmaris Longus-Action
    • Tense the palmar fascia
    • Flex the wrist (radiocarpal joint)
    • May assist to flex the elbow (humeroulnar joint)
  34. Palmaris Longus-Origin
    Common flexor tendon from medial epicondyle of humerus
  35. Palmaris Longus-Insertion
    Flexor retinaculum and palmar aponeurosis
  36. Palmaris Longus-Innervation
    Median C6, 7, 8, T1
  37. Flexor Carpi Ulnaris-Action
    • Flex the wrist (radiocarpal joint)
    • Adduct the wrist (radiocarpal joint)
    • Assist to flex the elbow (humeroulnar joint)
  38. Flexor Carpi Ulnaris-Origin
    • Humeral head:
    •   *Comon flexor tendon from medial epicondyle of humerus
    • Ulnar head:
    •   *Posterior surface of proximal two0thirds of ulna
  39. Flexor Carpi Ulnaris-Insertion
    Pisiform, hook or the hamate and base of the fifth metacarpal
  40. Flexor Carpi Ulnaris-Innervation
    Ulnar C7, 8, T1
  41. Flexor Digitorum Superficialis-Action
    • Flex the 2nd-5th fingers (mcp and proximal ip joints)
    • Flex the wrist (radiocarpal joint)
  42. 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
  43. Flexor Digitorum Superficialis-Insertion
    Sides of middle phalanges of 2nd-5th fingers
  44. Flexor Digitorum Superficialis-Innervation
    Median C7, 8, T1
  45. Flexor Digitorum Profundus-Action
    • Flex the 2nd-5th fingers (mcp and distal ip joints)
    • Assist to flex the wrist (radiocarpal joint)
  46. Flexor Digitorum Profundus-Origin
    Anterior and Medial surfaces of proximal three-quarters of ulna
  47. Flexor Digitorum Profundus-Insertion
    Bases of distal phalanges, palmar surface of 2nd-5th fingers
  48. Flexor Digitorum Profundus-Innervation
    • First and second: Medial C7, 8, T1
    • Third and fourth: Ulnar C7, 8, T1
  49. Pronator Teres-Action
    • Pronate the forearm (radioulnar joints)
    • Assist to flex the elbow (humeroulnar joint)
  50. Pronator Teres-Origin
    Common flexor tendon from the medial epicondyle of humerus and coronoid process of the ulna
  51. Pronator Teres-Insertion
    Middle of lateral surface of the radius
  52. Pronator Teres-Innervation
    Median C6, 7
  53. Pronator Quadratus-Action
    Pronate the forearm (radioulnar joints)
  54. Pronator Quadratus-Origin
    Medial, anterior surface of distal ulna
  55. Pronator Quadratus-Insertion
    Lateral, anterior surface of distal radius
  56. Pronator Quadratus-Innervation
    Medial C7, 8, T1
  57. Supinator-Action
    Supinate the forearm (radioulnar joints)
  58. Supinator-Origin
    Lateral epicondyle of humerus, radial collateral ligament, annular ligament and supinator crest of the ulna
  59. Supinator-Insertion
    Anterior, lateral surface of proximal one-third of radial shaft
  60. Supinator-Innervation
    Radial C5, 6, 7
  61. Abductor Pollicis Longus-Action
    • Abduct the thumb (carpometacarpal joint)
    • Extend the thumb (cmc joint)
    • Abduct the wrist (radiocarpal joint)
  62. Abductor Pollicis Longus-Origin
    Posterior surface of radius and ulna, and interosseous membrane
  63. Abductor Pollicis Longus-Insertion
    Base of 1st metacarpal
  64. Abductor Pollicis Longus-Innervation
    Radial C6, 7, 8
  65. Extensor Pollicis Longus and Brevis-Action
    • Extend the thumb (interphalgeal joint)
    • Extend the thumb (mcp joint and carpometacarpal joints)
    • Abduct the wrist (radiocarpal joint)
  66. Extensor Pollicis Longus and Brevis-Origin
    • Longus: posterior surface of ulna and interosseous membrane
    • Brevis: posterior surface of radius and interosseous membrane
  67. Extensor Pollicis Longus and Brevis-Insertion
    • Longus: Base of distal phalanx of thumb
    • Brevis: Base of proximal phalanx of thumb
  68. Extensor Pollicis Longus and Brevis-Innervation
    Radial C6, 7, 8
  69. Flexor Pollicis Longus-Action
    • Flex the thumb (ip joint)
    • Flex the thumb (mcp and carpometacarpal joints)
    • Assist to flex the wrist (radiocarpal joint)
  70. Flexor Pollicis Longus-Origin
    Anterior surface of radius and interosseous membrane
  71. Flexor Pollicis Longus-Insertion
    Base of distal phalanx of thumb
  72. Flexor Pollicis Longus-Innervation
    Median C6, 7, 8, T1
  73. Abductor Pollicis Brevis-Action
    • Abduct the thumb (carpometacarpal and mcp joints)
    • Assist in opposition of the thumb
  74. Abductor Pollicis Brevis-Origin
    Flexor retinaculum, trapezium and scaphoid tubercles
  75. Abductor Pollicis Brevis-Insertion
    Base of proximal phalanx of thumb
  76. Abductor Pollicis Brevis-Innervation
    Median C6, 7, 8, T1
  77. Flexor Pollicis Brevis-Action
    • Flex the thumb (carpometacarpal and mcp joints)
    • Assist in opposition of the thumb
  78. Flexor Pollicis Brevis-Origin
    • Superficial head: Flexor retinaculum
    • Deep head: trapezium, trapezoid and capitate
  79. Flexor Pollicis Brevis-Insertion
    base of proximal phalax of thumb
  80. Flexor Pollicis Brevis-Innervation
    • Superficial head: Median C6, 7, 8, T1
    • Deep head: Ulnar C8, T1
  81. Opponens Pollicis-Action
    Opposition of the thumb at the carpometacarpal joint (bringing the pads of the thumb and 5th finger together)
  82. Opponens Pollicis-Origin
    Flexor retinaculum and tubercle of the trapezium
  83. Opponens Pollicis-Insertion
    Entire length of the 1st metacarpal bone, radial surface
  84. Opponens Pollicis-Innervation
    Median C6, 7, 8, T1
  85. Adductors Pollicis-Action
    • Adduct the thumb (carpometacarpal and mcp joints)
    • Assist to flex the thumb (mcp joint)
  86. Adductors Pollicis-Origin
    Capitate, 2nd and 3rd metacarpals
  87. Adductors Pollicis-Insertion
    Base of proximal phalanx of thumb
  88. Adductors Pollicis-Innervation
    Ulnar C8, T1
  89. Lumbricals of the hand-Action
    • Extend the 2nd-5th fingers at the ip joints
    • flex the 2nd-5th fingers at the mcp joints
  90. Lumbricals of the hand-Origin
    Surfaces of the flexor digitorum profundus tendons
  91. Lumbricals of the hand-Insertion
    Externsor aponeurosis on dorsal surface of phalanges
  92. Lumbricals of the hand-Innervation
    • 2nd and 3rd fingers: Median C6, 7, 8, T1
    • 4th and 5th fingers: Ulnar C7, 8, T1
  93. Palmar Interossei-Action
    • Adduct the thumb, 2nd, 4th, and 5th fingers toward the third finger
    • Assist to felx the thumb, 2nd, 4th, and 5th fingers at the mcp joints
    • Assist to extend the thumb, 2nd 4th and 5th fingers at the ip joints
  94. Palmar Interossei-Origin
    Bae of the 1st, 2nd 4th, and 5th metacarpals
  95. Palmar Interossei-Insertion
    Base of the proximal phalanx of the related finger and the extensor aponeurosis
  96. Palmar Interossei-Innervation
    Ulnar C8, T1
  97. Dorsal Interossei-Action
    • Abduct the 2nd, 3rd, and 4th fingers at the mcp joints
    • Assist to flex the 2nd, 3rd, and 4th fingers at the mcp joints
    • Assist to extend the 2nd, 3rd, and 4th fingers at the ip joints
  98. Dorsal Interossei-Origin
    Adjacent sides of all metacarpals
  99. Dorsal Interossei-Insertion
    Base of the proximal phalanx of the 2nd, 3rd, and 4th fingers and the extensor aponeurosis
  100. Dorsal Interossei-Innervation
    Ulnar C8, T1
  101. Abductor Digiti Minimi-Action
    • Abduct the 5th finger (mcp joint)
    • Assist in opposition of the fifth finger toward the thumb (mcp joint)
  102. Abductor Digiti Minimi-Origin
    pisiform and tendon of flexor carpi ulnaris
  103. Abductor Digiti Minimi-Insertion
    Base of proximal phalanx of 5th finger, ulnar surface
  104. Abductor Digiti Minimi-Innervation
    Ulnar C7, 8, T1
  105. Flexor Digiti Minimi Brevis-Action
    • Flex the 5th finger (mcp joint)
    • Assist in opposition of the 5th finger toward the thumb
  106. Flexor Digiti Minimi Brevis-Origin
    Hook of hamate and flexor retinaculum
  107. Flexor Digiti Minimi Brevis-Insertion
    Base of proximal phalanx of 5th finger, palmar surface
  108. Flexor Digiti Minimi Brevis-innervation
    Ulnar C7, 8, T1
  109. Opponens Digiti Minimi-Action
    Opposition of the 5th finger at the carpometacarpal joint
  110. Opponens Digiti Minimi-Origin
    Hook of hamate and flexor retinaculum
  111. Opponens Digiti Minimi-Insertion
    Shaft of 5th metacarpal, ulnar surface
  112. Opponens Digiti Minimi-Innervation
    Ulnar C7, 8, T1

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