The knee-jerk or 'patellar jerk' reflex occurs when the knee is tapped below the knee-cap (patella). Sensors that detect stretching of the tendon of this area send ...

The knee jerk reflex can be tested by tapping just below the knee causing the lower leg to suddenly jerk forward. You are working the patella tendon. This is the tendon that runs down from the ...

You might have experienced the popular knee jerk in the doctors room or you may have heard of someone having an automatic 'knee-jerk response' to a situation without thinking. Strange, isn't it? Well, ...