what nervous system conducts impulses from the brain and spinal cord to skeletal muscle, thereby causing us to respond or react to changes in our external environment.
1) sensory neuronsâreceive impulses and carry them from the sense organs to the spinal cord or brain. 2) interneuronsâconnect sensory and motor neurons and interpret the impulse; only in the brain and spinal cord. 3) motor neuronsâcarry impulses from the brain and spinal cord to muscles or glands.