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The flexor reflex is a protective withdrawal reflex that removes a limb from a noxious stimulus. It involves a minimum of two interneurons and three synapses within the central nervous system. This reflex is distinct from the stretch reflex, which has only one synapse between the afferent nerve fiber and the motor neuron. Flexor muscles are those that decrease the angle between bones at a joint, such as bending the elbow or knee.12

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