inverted brachioradialis jerk

Last reviewed 01/2018

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