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A reflex arc is a neural pathway that controls a reflex action. In higher animals, most sensory neurons do not pass directly into the brain, but synapse in the spinal cord.his characteristic allows reflex actions to occur relatively quickly by activating spinal motor neurons without the delay of routing signals through the brain, although the brain will receive sensory input while the reflex is carried out. Analysis of the signal takes place after action has been taken.
1-7. REFLEX ARC An impulse follows a conduction pathway from its origin in the dendrites or neuron cell body in one part of the body to the impulse's end somewhere else in the body.One pathway is called a reflex arc and is a functional unit of the nervous system.The basic parts of a reflex arc are a receptor, a sensory neuron, a center, a motor neuron, and an effector. a. Function of Components of a Reflex Arc.Functions are: (1) Receptor. The receptor activates a nerve impulse in a sensory neuron in response to a change in the body's internal or external environment.(2) Sensory neuron. This neuron conducts the impulse from the receptor to its axonal end in the central nervous system.he receptor activates a nerve impulse in a sensory neuron in response to a change in the body's internal or external environment. (2) Sensory neuron. This neuron conducts the impulse from the receptor to its axonal end in the central nervous system.