Which component of a reflex arc connects the sensory neuron to the motor neuron within the spinal cord?

Explanation

The associative or relay neurone sits in the grey matter of the spinal cord and passes the impulse straight from the sensory to the motor neurone, which is what allows the response to happen before the brain is even informed. The receptor detects the stimulus at the start of the arc and the effector, usually a muscle or gland, produces the response at the end. A muscle fibre is part of the effector rather than a link in the pathway.