MEDICAL PHYSIOLOGY

Detailed explanation-1: -knee-jerk reflex, also called patellar reflex, sudden kicking movement of the lower leg in response to a sharp tap on the patellar tendon, which lies just below the kneecap.

Detailed explanation-2: -The patellar reflex, also called the knee reflex or knee-jerk, is a stretch reflex which tests the L2, L3, and L4 segments of the spinal cord.

Detailed explanation-3: -If your doctor taps on a tendon and there isn’t a reflexive movement in the muscle, it’s a sign of a health issue. Usually, absent reflexes are caused by an issue with the nerves in the tendon and muscle. You may have other muscle symptoms along with areflexia, like weakness, twitching, or atrophy.