WILL & DENI MCINTYRE / SCIENCE PHOTO LIBRARY WILL & DENI MCINTYRE / SCIENCE PHOTO LIBRARY
Reflex test. Hospital doctor using a hammer to test the reflexes of a 15-year-old girl. He is tapping her elbow at a particular point where a tendon runs above the joint. If the sensory nerves in her tendons and muscles are functioning, this should prompt a reflex (automatic) reaction and her lower arm should then twitch upwards as the arm muscles contract.
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