Inverted brachioradialis jerk
An inverted brachioradialis reflex:
- is said to be present when the supinator reflex elicits finger flexion and not elbow flexion
- is associated with an absent biceps jerk and an exaggerated triceps jerk
- is indicative of a spinal cord lesion at C5 or C6, e.g. due to trauma, syringomyelia, or disc prolapse
- occurs because a lower motor neurone lesion of C5 is combined with an upper motor neurone lesion affecting reflexes below C5
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