The difference between a three- and a two-neuron reflex is that a three-neuron reflex is A two-neuron reflex arc consisting of only two types of neurons and a three-neuron reflex arc consists of all three.
The neuro reflex arc is characterized by peripheral afferent sensory input that is relayed to and processed by the central nervous system. The resulting action is carried to the periphery by efferent motor neurons. Each reflex arc involves at least two synaptic connections.
sensory neurons send electrical impulses to relay neurons in the CNS spinal cord. Relay neurons connect sensory neurons to motor neurons. Motor neurons send electrical impulses to effectors. An effector produces a response (muscle contracts to move the hand away).
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