Class # 9 Forearm and Wrist

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princessmagonda
ID:
91562
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Class # 9 Forearm and Wrist
Updated:
2011-06-25 11:49:56
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Class Forearm Wrist
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Class # 9 Forearm and Wrist
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  1. Radiocarpal Joint

    1) What is it between?
    2) Movements?
    • 1) distal radius, scaphoin, and lunate; articular disc and triquetrum
    • 2) flexion/extension, abduction (radial deviation), adduction (ulnar deviation) --> circumduction
  2. Distal Radioulnar Joint

    1) What is it between? What binds them together?
    2) Movements?
    • 1) rounded head of the ulna and the ulnar notch of the radius; fibrocartilaginous triangular disc.
    • 2) pronation and supination
  3. Muscle: Pronator Teres (ant. superficial)
    Origin?
    Insertion?
    Innervation?
    Action?
    • Origin:
    • Humeral Head: Medial Humeral epicondyle
    • Ulnar Head: coronoid process of ulna
    • Insertion:
    • middle of convexity of lateral surface of radius
    • Innervation: median nerve (C6, C7)
    • Action: pronates and flexes forearm @ elbow
  4. Muscle: Flexor capri radialis (ant. superficial)
    Origin?
    Insertion?
    Innervation?
    Action?
    • Origin: Medial Humeral Epicondyle
    • Insertion: base of 2nd (3rd) metacarpal
    • Innervation: median nerve (C6, C7)
    • Action: Flexes & abducts hand (@ wrist)
  5. Muscle: Palmaris longus (ant. superficial)
    Origin?
    Insertion?
    Innervation?
    Action?
    • Origin: medial humeral epicondyle
    • Insertion:
    • distal half of flexor retinaculum, palmar aponeurosis
    • Innervation: median nerve (C7. C8)
    • Action:
    • Flexes hand (@ wrist) & tenses palmar aponeurosis; not found in everyone
  6. Muscle: Flexor carpi ulnaris (ant. superficial)
    Origin?
    Insertion?
    Innervation?
    Action?
    • Origin:
    • medial humeral epicondyle (ppt)
    • olecranon & post. border (via aponeurosis) (text)
    • Insertion: pisoform, hook of hamate, 5th metacarpal
    • Innervation: ulnar nerve (C7, C8)
    • Action: flexes & adducts hand 9 (@ wrist)
  7. Muscle: Flexor digitorum superficialis (ant. intermediate)
    Origin?
    Insertion?
    Innervation?
    Action?
    • Origin:
    • Humeral ulnar head: medial epicondyle of humerus & coronoid process of ulna
    • Radial Head: oblique line of radius
    • Insertion: middle phalanges of digits 2-5
    • Innervation: median nerve (C7, C8, T1)
    • Action:
    • flexing PIP (proximal interphalangeal joints) of digits 2-5.
  8. Muscle: Flexor Pollicis longus (ant. deep)
    Origin?
    Insertion?
    Innervation?
    Action?
    • Origin:
    • ant. surface of radius @ adjacent interosseus membrane
    • Insertion: distal phalanx of thumb
    • Innervation:
    • ant. interosseous nerve, from median nerve (C8, T1)
    • Action: flexes the thumb (phalanges of 1st digit)
  9. Muscle: Flexor digitorum profundus (ant. deep)
    Origin?
    Insertion?
    Innervation?
    Action?
    • Origin:
    • proximal 3 quarters of medial & ant. surfaces of ulna & interosseous membrane
    • Insertion: on the distal phalanges of digits 2-5
    • Innervation:
    • Lat. part (digits 2 & 3) median nerve(C8, T1) (ant. interosseous branch). Medial part (digits 4 & 5) ulnar nerve (C8, T1)
    • Action:
    • flexes the DIP joints (distal interphalangeal) digits 2-5; assists w/wrist flexion
  10. Muscle: Pronator quadratus (ant. deep)
    Origin?
    Insertion?
    Innervation?
    Action?
    • Origin: distal quarter of ant. surface of ulna
    • Insertion: distal quarter of ant. surface of radius
    • Innervation:
    • ant. interosseous nerve, from median nerve (C8, T1)
    • Action:
    • Pronates forearm; deep fibers bind radius & ulna together
  11. Ligament: Flexor retinaculum
    On distal row, what is on each side?
    On proximal row, what is on each side?
    • Distal: hook of the hamate to trapezium
    • proximal: pisoform to tubercle of scaphoid
  12. Muscle: Brachioradialis (post. superficial)
    Origin?
    Insertion?
    Innervation?
    Action?
    • Origin: lateral supercondyle ridge of humerus
    • Insertion: lateral surface of distal end of radius proximal to styloid process
    • Innervation: radial nerve (C5, C6, C7)
    • Action: flexes the elbow & plays a minor role in pronation & supination back to neutral (ppt); weak flexion of forearm, maximal when forearm is in midpronated position (text)
  13. Muscle: Extensor carpi radialis longus (post. superficial)
    Origin?
    Insertion?
    Innervation?
    Action?
    • Origin: lateral supracondylar ridge of humerus
    • Insertion: dorsal aspect of base of 2nd metacarpal
    • Innervation: radial nerve (C6, C7)
    • Action: extend & abduct hand at the wrist joint
  14. Muscle: Extensor carpi radialis brevis (post. superficial)
    Origin?
    Insertion?
    Innervation?
    Action?
    • Origin: lateral epicondyle of humerus (common extensor origin)
    • Insertion: dorsal aspect of base of 3rd metacarpal
    • Innervation: deep branch of radial never (C7, C8)
    • Action: extend & abduct hand at the wrist joint.
  15. Muscle: Extensor digitorum (post. superficial)
    Origin?
    Insertion?
    Innervation?
    Action?
    • Origin: lateral epicondyle of humerus (common extensor origin)
    • Insertion: extensor expansions of medial four fingers
    • Innervation: post. interosseous nerve (C7, C8), continuation of deep branch of radial nerve
    • Action: extends digits 2-5 at metacarpophalangeal joints, secondarily at interphalangeal joints
  16. Muscle: Extensor digiti minimi (post. superficial)
    Origin?
    Insertion?
    Innervation?
    Action?
    • Origin: lateral epicondyle of humerus (common extensor origin)
    • Insertion: extensor expansion of 5th finger
    • Innervation: post. interosseous nerve (C7, C8), continuation of deep branch of radial nerve
    • Action: extends 5th finger primarly at metacarpophalangeal joint, secondarily at interphalangeal joint.
  17. Muscle: Extensor carpi ulnaris (post. superficial)
    Origin?
    Insertion?
    Innervation?
    Action?
    • Origin: lateral epicondyle of humerus post. border of ulna via a shared aponeurosis (text)
    • Insertion: dorsal aspect of base of 5th metacarpal
    • Innervation: post. interosseous nerve (C7, C8), continuation of deep branch radial nerve
    • Action: extends & adducts hand @ wrist joint
  18. Muscle: Supinator (post. deep)
    Origin?
    Insertion?
    Innervation?
    Action?
    • Origin: lateral epicondyle of humerus (ppt); radial collateral & anular ligaments; supinator fossa; crest of ulna
    • Insertion: lat., post., & ant. surfaces of proximal third of radius
    • Innervation: deep branch of radial nerve (C7, C8)
    • Action: supinates forearm; rotates radius to turn palm anteriorly or superiorly (if elbow is flexed)
  19. Muscle: abductor pollicis longus (post. deep; outcropping)
    Origin?
    Insertion?
    Innervation?
    Action?
    • Origin: post. surface of proximal halves of ulna, radius, & interosseous membrane
    • Insertion: base of 1st metacarpal
    • Innervation: post. interosseous nerve (C7, C8), continuation of deep branch of radial nerve
    • Action: abducts thumb & extends it @ carpometacarpal joint
  20. Muscle: extensor pollicis longus (post. deep; outcropping)
    Origin?
    Insertion?
    Innervation?
    Action?
    • Origin: post. surface of middle third of ulna & interosseous membrane
    • Insertion: dorsal aspect of base of distal phalanx of thumb
    • Innervation: post. interosseous nerve (C7, C8), continuation of deep branch of radial nerve
    • Action: extends distal phalanx of thumb of interphalangeal joint; extends metacarpophalangeal & carpometacarpal joints
  21. Muscle: extensor pollicis brevis (post. deep; outcropping)
    Origin?
    Insertion?
    Innervation?
    Action?
    • Origin: post. surface of distal third of radius & interosseous membrane
    • Insertion: dorsal aspect of base of proximal phalanx of thumb
    • Innervation: post. interosseous nerve (C7, C8), continuation of deep branch of radial nerve
    • Action: extends proximal phalanx of thumb at metacarpophalangeal joint; extends carpometacarpal joint
  22. Muscle: extensor indicis; pointer finger (post. deep; outcropping)
    Origin?
    Insertion?
    Innervation?
    Action?
    • Origin: post. surface of distal third of ulna & interosseous membrane
    • Insertion: extensor expansion of 2nd finger
    • Innervation: post. interosseous nerve (C7, C8), continuation of deep branch of radial nerve
    • Action: extends 2nd finger (enabling independent flexion); helps extend hand at wrist.

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