Cambridge O Level Biology · Syllabus 5090 · Coordination and Control
Relay Neurone
What is Relay Neurone?
A neurone found within the central nervous system that connects a sensory neurone to a motor neurone. It is short and carries many connections, and in a simplified diagram it is recognised by its small size and the number of short branches leaving the cell body.
This definition is part of the Coordination and Control chapter in Cambridge O Level Biology.
Questions students ask about Relay Neurone
What is the order of a reflex arc?
Stimulus, receptor, sensory neurone, relay neurone in the central nervous system, motor neurone, effector, response. The effector is a muscle or a gland, and the impulse never travels backwards along this pathway.
Last reviewed Syllabus 2026-2028