The nervous system consists of the brain, the spinal cord, nerves, and motor neurons. where should a colon be added to this sentence? select one: the nervous system consists: of the brain, the spinal cord, nerves, and motor neurons. you cannot add a colon to this sentence as it is constructed. the nervous system consists of: the brain, the spinal cord, nerves, and motor neurons. the nervous system: consists of the brain, the spinal cord, nerves, and motor neurons.