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Learn something new every day More Info A knee-jerk reaction is an emotional rather than an analytical response to something. The term is named after the response usually caused by the medical reflex test in which the leg jerks forward when the tendon below the knee is struck with a rubber mallet. As early as the tenth century, the term knee-jerk reaction was used figuratively to refer to an unthinking reaction. Today, many people see this expression used in political debates. One candidate may accuse the other of responding to a certain issue in a poorly thought out response rather than in a way that provides an adequate solution to a problem.
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knee-jerk reaction

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KNEE-JERK | meaning in the Cambridge English Dictionary

The patellar reflex or knee-jerk myotatic monosynaptic American spelling knee reflex [1] is a stretch reflex which tests the L2, L3, and L4 segments of the spinal cord. Striking of the patellar tendon with a reflex hammer just below the patella stretches the muscle spindle in the quadriceps muscle. This produces a signal which travels back to the spinal cord and synapses without interneurons at the level of L3 in the spinal cord, completely independent of higher centres. From there, an alpha motor neuron conducts an efferent impulse back to the quadriceps femoris muscle , triggering contraction. This contraction, coordinated with the relaxation of the antagonistic flexor hamstring muscle causes the leg to kick. This is a reflex of proprioception which helps maintain posture and balance , allowing to keep one's balance with little effort or conscious thought. The patellar reflex is a clinical and classic example of the monosynaptic reflex arc.
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The meaning and origin of the expression: Knee-jerk reaction

With one of his typical knee-jerk reactions, he said no immediately, citing some moral argument that no one understood. References in periodicals archive? It is a knee-jerk reaction with political undertones. Shisha ban: Cleric and MCA clash, raise questions on miraa and muguka.
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