FN: Other Nerve Injuries Flashcards Preview

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Flashcards in FN: Other Nerve Injuries Deck (13):
1

Radial Nerve Lesions (C5-T1) Low lesions:

Posterior interosseous nerve

2

Radial Nerve Lesions (C5-T1) Low lesions: site

Fracture around elbow or forearm e.g. fracture head of the radius

3

Radial Nerve Lesions (C5-T1) Low lesions: loss

Loss of extension of CMC joints (fnger drop)
No sensory loss

4

Radial Nerve Lesions (C5-T1) high lesions site

Fracture of shaft of humerus where N. is in radial groove

5

Radial Nerve Lesions (C5-T1) high lesions presentation

Wrist drop
Loss of sensation to dorsum of thumb root (snuff box)
Triceps functions normally

6

Radial Nerve Lesions (C5-T1) high lesions very high lesions site

Axilla e.g. crutches or SAturday night palsy

7

Radial Nerve Lesions (C5-T1) high lesions very high lesions presentation

Paralysis of triceps and wrist drop

8

Ulnar Nerve (C8-T1) damage site

Elbow: cubital tunnel
Wrist: in Guyons Canal

9

Ulnar Nerve (C8-T1) effects

- Intrinsic hand muscle paralysis - claw hand
- Ulnar paradox, lesion at elbow has less clawing as FDP is paralysed, decreasing flexion at 4th/5th digits
- Weakness of finger ab/abduction (interossei)
- Sensory loss over little finger

10

Ulnar Nerve (C8-T1) Tests

- Cant cross fingers for luck
- Forments sign: flexion of thumb IPJ when trying to hold onto paper held between thumb and finger - indicates weak adductor pollicis

11

Median Nerve (C5-T1) injury above the antecubital fossa

- Cant flex index finger IPJs (e.g. on clasping hands)
- Cant flex terminal thumb phalanx (FPL)
- Loss of sensation in median distribution

12

Median Nerve (C5-T1) injury at the wrist

- Typically affects abductor pollicis brevis

13

Median Nerve (C5-T1) injury types

- injury above the antecubital fossa
- injury at the wrist
- Carpal tunnel syndrome

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