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When a provider taps the patellar tendon just below the kneecap, it stretches the tendon and the connected quadriceps muscle. This stretch activates sensory neurons that send a signal to the spinal cord, where it synapses with motor neurons. The motor neurons then send a signal back to the quadriceps, causing the muscle to contract and resulting in the characteristic knee-jerk reflex. This reflex is a simple, monosynaptic pathway that helps assess the integrity of the nervous system.

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2mo ago

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