Forearm

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Author:
lancesadams
ID:
63394
Filename:
Forearm
Updated:
2011-02-06 12:08:22
Tags:
Anatomy S1M1
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Description:
Forearm
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  1. What holds down the tendons in the wrist
    Flexor Retinaculum
  2. Colles Fracture is
    • Mechanism of Injury:
    • • Fall on outstretched, pronated hands

    • Clinical Implications:
    • Complete transverse fracture of distal radius

    • Dorsal displacement of hand relative to wrist (Dinner Fork Deformity)
    • • Ulnar styloid process may also be avulsed
    • • Risk of injury to median nerve (may mimic Carpal Tunnel Syndrome)
  3. Interosseous Membrane
    Is the seperation of the anterior and posterior muscles of the upper arm between the radius and ulna
  4. Flexor Carpi Radialis action and innervation
    • Action
    • Flex and abduct hand at wrist

    Innervation Median n. (C6, C7)
  5. Flexor Carpi Ulnaris action and innervation
    Action Flex and adduct hand at wrist

    Innervation Ulnar n. (C7, C8)
  6. Palmaris Longus action and innervation
    (absent ~14% of population)

    Action Flex hand at wrist, tenses palmar aponeurosis

    Innervation Median n. (C7, C8)
  7. Pronator Teres action and innervation
    • Action Pronate and flex forearm at elbow
    • Innervation Median n. (C6, C7)
  8. Flexor Digitorum Superficialis
    • Action: Flex middle and proximal phalanges (digits II-V)
    • Innervation Median n. (C7, C8, T1)
  9. Flexor Digitorum Profundus action and innervation
    Action Flex distal phalanges (digits II-V)

    Innervation Lateral half: Median n. (C7, C8, T1)Medial half: Ulnar n. (C8, T1)
  10. Flexor Pollicis Longus action and innervation
    Action Flex distal and proximal phalanx of pollex (digit I = thumb)

    Innervation Median n. (C8, T1)
  11. The brachial radialis action gives it an alternative name of
    The drinking muscle, because it is used to raise a glass
  12. Pronator Quadratus
    Action Pronate forearm, bind radius and ulna together

    Innervation Median n. (C8, T1)
  13. Supracondylar Fracture (distal humerus) Clinicle implications
    • Clinical Implications:
    • • Distal shaft fragment displaced (posteriorly)
    • Limb shortening
    • • Risk of brachial a. laceration
    • • Risk of median n. damage
    • Motor & sensory loss
    • “Hand of Benediction” (when making a fist)
  14. Pronator Syndrome caused by
    • Mechanism of Injury:
    • • Median n. compressed between ulnar & humeral heads of pronator teres m.
    • • Trauma, muscle hypertrophy, fibrous bands

    • Clinical Implications:
    • • Symptoms present after provacative test
    • Pronation against resistance
    • Pain in forearm, paresthesia of hand
  15. Fracture & Avulsion of the Medial Epicondyle
    • Clinical Implications:
    • • High risk of ulnar n. injury
    • Motor & sensory loss
    • Claw Hand deformity (when making a fist)
  16. Brachioradialis action and innervation
    • Action
    • Flex forearm at elbow
    • Innervation
    • Radial n. (C5, C6, C7)
  17. Extensor carpi ulnaris action and innervation
    Action Extend and adduct hand at wrist Innervation Radial n. deep branch (C7, C8)
  18. Extensor carpi radialis longus & brevis Action and innervation
    Extend and abduct hand at wrist

    Innervation ECRL: Radial n. ( C6, C7); ECRB: Radial n. deep branch (C7, C8)
  19. Extensor digitorum (+ ext. digiti minimi & ext. indicis) action and innervation
    Action Extend distal, middle and proximal phalanges (digits II-V)

    Innervation Radial n. deep branch (C7, C8)
  20. Supinator innervation
    Innervation Radial n. deep branch (C7, C8)
  21. Extensor pollicis longus
    Innervation Radial n. deep branch (C7, C8)
  22. Extensor pollicis brevis innervation
    Innervation Radial n. deep branch (C7, C8)
  23. Abductor pollicis longus innervation
    Innervation Radial n. deep branch (C7, C8)
  24. “Wrist Drop” is due to
    Damage to radial n., usually at humerus mid-shaft (radial groove
  25. Medial Epicondylitis is also known as
    • “golfer’s elbow”
  26. Lateral Epicondylitis is also known as
    Tennis elbow

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