2nd October 2019

wikipedia
15

What causes the knee jerk reflex?

The patellar reflex is a clinical and classic example of the monosynaptic reflex arc. There is no interneuron in the pathway leading to contraction of the quadriceps muscle. Instead, the bipolar sensory neuron synapses directly on a motor neuron in the spinal cord.

Similarly one may ask, what happens in a knee jerk reflex?

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. In reaction these muscles contract, and the contraction tends to straighten the leg in a kicking motion.
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