Final answer:
Motor neurons carry motor commands from the brain along the spinal cord.
Step-by-step explanation:
The motor neurons carry motor commands from the brain along the spinal cord. These neurons have long processes called axons which transmit action potentials from the spinal cord to the muscles. The motor commands control voluntary movements of skeletal muscles and are sent down the corticospinal tract, which largely crosses the midline of the brainstem or spinal cord and synapses on the opposite side of the body.