Which type of neuron acts as a link between sensory and motor neurons?

• A. Interneurons
• B. Sensory neurons
• C. Motor neurons
• D. Glial cells

Answer: (A)

Interneurons are the connectors inside the central nervous system that receive signals from sensory neurons and pass them on to motor neurons, enabling information to be processed and coordinated into a response. They sit between the input from senses and the output to muscles or glands, and they can modulate signals, sometimes exciting and other times inhibiting pathways to produce appropriate actions. This bridging role is what makes them the link between sensing and acting.

Sensory neurons carry information from receptors toward the CNS, so they provide the input but don’t connect directly to motor pathways. Motor neurons carry commands from the CNS to muscles or glands, producing the action. Glial cells are support cells that help nourish, insulate, and protect neurons; they’re not neurons themselves and don’t relay signals between sensory and motor pathways.