How do sensory neurons and motor neurons work together during a reflex?

During a reflex, sensory and motor neurons work together as part of a reflex arc to produce an immediate, automatic response to a stimulus.12

The process typically functions as follows:

• Sensory Input: Sensory neurons (or receptors) detect a stimulus, such as touching a hot surface, and convert it into an electrical impulse.132
• Transmission: These afferent impulses travel along the sensory neuron toward the central nervous system, specifically the spinal cord.32
• Integration: In many cases, the sensory neuron connects to an interneuron, which processes the signal and communicates with a motor neuron. In simpler two-neuron arcs, the sensory neuron may connect directly to the motor neuron.12
• Motor Response: The motor neuron carries efferent impulses away from the spinal cord to an effector, such as a muscle, which then contracts to perform the reflex action, such as pulling a hand away from heat.132

This mechanism allows the body to initiate movement rapidly, often before the brain even registers conscious awareness of the stimulus.3