Reflex Arc It’s a neural pathway that mediates in a reflex action. The sensory neurons pass through the spinal cord which allows reflex actions to occur relatively quickly by activating spinal motor neurons without the delay of steering signals through the brain, although the brain will receive sensory input while the reflex action occurs.

Reflex Arc Monosynaptic- When a reflex arc consists of only two neurons in an animal ,one sensory neuron and one motor neuron. It refers to the presence of a single chemical synapse. In the case of peripheral muscle reflexes brief stimulation to the muscle spindle results in contraction of the agonist muscle. Polysynaptic- Reflex pathways, one or more interneurons connect afferent/sensory and efferent/motor signals. All but the most simple reflexes are polysynaptic, allowing processing of polysynaptic reflexes within the spinal cord.