Write On Features Lower Motor Neuron Lesion

MIXED UPPER AND LOWER MOTOR NEURON WEAKNESS - UNILATERAL OR BILATERAL

Useful localising features (not always present)

Arm lower motor neuron

upper motor neuron

Leg upper motor neuron

{Lower motor neuron lesion identifies the level of segmental V cord damage, e.g. weak arm abductors, 1 C5 lower weak elbow flexors, I motor neuron

reduced biceps jerk, weak elbow extension, increased triceps jerk.

lesion

C7 level upper motor neuron lesion

C5 lesion but note that wasting of the small hand muscles (Tl) may accompany cervical lesions at any level.

Leg lower motor neuron +

upper motor neuron

Upper motor neuron signs are important in detecting level of cord damage (since lower motor neuron signs may result from cither segmental damage or root damage from a higher level).

LUMBOSACRAL SPINE LESION L2

LUMBOSACRAL SPINE LESION L2

N.B. Dual lesions, e.g. cervical + lumbar spondylosis may cause mixed (umn and Imn) signs in both arm and leg.

LOWER MOTOR NEURON LIMB WEAKNESS - UNILATERAL OR BILATERAL

Note the muscle groups involved and the area of sensory impairment (if present). Does this fit the distribution of - one or more NERVE ROOTS -(pages 20-25) root distribution without sensory deficit---------

' the BRACHIAL PLEXUS (page 430)

the LUMBOSACRAL PLEXUS (page 438)

a PERIPHERAL NERVE (page 433-436, 438-140).

Anterior horn cell

Anterior horn cell

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