Myotomes and Differentiating Nerve Lesions



Myotomes and Differentiating Nerve Lesions

15/2/11

FANZCA Notes

Tom Thomson’s Neurology Notes

Mark Sherwood’s Yellow Card

UPPER LIMB

Shoulder Abduction - C5 (axillary)

Shoulder Adduction – C678

Elbow Flexion - C5 (musculocutaneous)

Elbow Extension - C7 (radial)

Wrist Flexion & Extension – C67 (radial)

Finger Flexion – C8 (median)

Finger Extension – C7 (radial – posterior interosseous)

Finger Abduction - T1 (ulnar)

Abductor pollis brevis – T1 (median)

Sorting out Muscles

- biceps vs brachioradialis (both test C56: tests musculocutaneous nerve vs radial, note biceps jerk)

- abductor pollis brevis vs first dorsal interosseus (both T1: test median vs ulnar)

- abductor polis brevis vs flexor pollicis longus (both median but abductor polis brevis supplied after the carpal tunnel)

LOWER LIMB

Hip Flexion - L2 (femoral)

Hip Extension - L5 (inferior gluteal)

Knee Extension - L34 (femoral)

Knee Flexion - S1 (sciatic)

Ankle Dorsiflexion - L4 (deep peroneal)

Ankle Plantarflexion - S1 (tibial)

Great toe flexor - L5 (deep peroneal)

Sorting out Muscles

- ankle dorsiflexors vs ankle inversion (both L4: tests deep peroneal vs tibial)

- ankle dorsiflexors vs ankle evertors (both common peroneal nerve tests: tests superficial vs deep)

- ankle dorsiflexors vs great toe flexor (both deep peroneal nerve tests L4 vs L5)

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