extensor forearm

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Author:
jtsterner
ID:
3175
Filename:
extensor forearm
Updated:
2009-12-15 19:49:12
Tags:
extensor forearm
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Description:
Origin, Insertion, Innervation & Function
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  1. Supinator
    O -Superficial part-lateral epicondyle of humerus, radial collateral & anular ligaments; deep part-supinator crest of ulna

    I -Lateral surface of radius superior to the anterior oblique line

    In -Posterior interosseous nerve [C6,C7]

    F -Supination
  2. Anconeus
    O -Lateral epicondyle of humerus

    I -Olecranon & proximal posterior surface of ulna

    In -Radial nerve [C6,C7,C8] (via branch to medial head of triceps brachii)

    F -Abduction of the ulna in pronation; accessory extensor of elbow joint
  3. Extensor carpi ulnaris
    O -Lateral epicondyle of humerus & posterior border of ulna

    I -Tubercle on base of the medial side of metacarpal V

    In -Posterior interosseous nerve [C7,C8]

    F -Extends & adducts the wrist
  4. Extensor carpi radialis longus
    O -Distal part of lateral supraepicondylar ridge of humerus & adjacent intermuscular septum

    I -Dorsal surface of base of metacarpal II

    In -Radial nerve [C6,C7] before division into superficial & deep branches

    F -Extends and abducts the wrist
  5. Extensor carpi radialis brevis
    O -Lateral epincondyle of humerus & adjacent intermuscular septum

    I -Dorsal surface of base of metacarpals II & III

    In -Deep branch of radial nerve [C7,C8] before penetrating supinator muscle

    F -Extends & abducts the wrist
  6. Extensor digitorum
    O -Lateral epicondyle of humerus & adjacent intermuscular septum & deep fascia

    I -Four tendons, which insert via extensor hoods into the dorsal aspects of the bases of the middle & distal phalanges of the index, middle, ring, & little fingers

    In -Posterior interosseous nerve [C7,C8]

    F -Extends the index, middle, ring, & little fingers; can also extend the wrist
  7. Extensor indicis
    O -Posterior surface of ulna (distal to extensor pollicis longus) & adjacent interosseous membrane

    I -Extensor hood of index finger

    In -Posterior interosseus nerve [C7,C8]

    F -Extends index finger
  8. Extensor digiti minimi
    O -Lateral epicondyle of humerus & adjacent intermuscular septum together with extensor digitorum

    I -Extensor hood of the little finger

    In -Posterior interosseous nerve [C7,C8]

    F -Extends the little finger
  9. Abductor pollicis longus
    O -Posterior surface of ulna & radius (distal to the attachments of supinator & anconeus), & intervening interosseous membrane

    I -Lateral side of base of metacarpal I

    In -Posterior interosseous nerve [C7,C8]

    F -Abducts carpometacarpal joint of thumb; accessory extensor of the thumb
  10. Extensor pollicis longus
    O -Posterior surface of ulna (distal to the abductor pollicis longus) & adjacent interosseous membrane

    I -Dorsal surface of base of distal phalanx of thumb

    In -Posterior interosseous nerve [C7,C8]

    F -Extends interphalangeal joint of the thumb; can also extend carpometacarpal & metacarpophalangeal joints of the thumb
  11. Extensor pollicis brevis
    O -Posterior surface of radius (distal to the abductor pollicis longus) & adjacent interosseous membrane

    I -Dorsal surface of base of proximal phalanx of thumb

    In -Posterior interosseous nerve [C7,C8]

    F -Extends interphalangeal joint of the thumb; can also extend carpometacarpal joint of the thumb
  12. Anatomical Snuff Box
    • lateral boundary:
    • 1. Tendon of Abductor pollicis longus
    • 2. Tendon of Extensor pollicis brevis

    • medial boundary:
    • 1. Tendon of Extensor pollicis longus

    • floor:
    • 1. Scaphoid
    • 2. Trapezium

    • contents:
    • - Radial artery
  13. Extensor Retinaculum Compartments (6)
    • Compartment 1: Tendons of
    • 1. Abductor pollicis longus
    • 2. Extensor pollicis brevis

    • Compartment 2: Tendons of
    • 1. Extensor carpi radialis longus
    • 2. Extensor carpi radialis brevis

    • Compartment 3: Tendons of
    • 1. Abductor pollicis brevis

    • Compartment 4: Tendons of
    • 1. Extensor digitorum
    • 2. Extensor indicis

    • Compartment 5: Tendons of
    • 1. Extensor digiti minimi

    • Compartment 6: Tendons of
    • 1. Extensor carpi ulnaris

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