The system of cells, cells, and body organs that regulates the body's responses to external and internal stimuli. In vertebrates it includes the brain, back, nerves, ganglia, and elements of the receptor and effector body organs.
An organ system that coordinates the activities of muscle tissue, screens organs, constructs and operations information obtained from senses, and initiates activities.
the sensory and control device composed of a network of neurological cells
the specialized coördinating equipment which endows animals with sensation and volition. In vertebrates it is often divided into three systems: the central, mind and back; the peripheral, cranial and spinal nerves; together with sympathetic. See Brain, Nerve, spinal-cord, under Spinal, and Sympathetic system, under Sympathetic, and Illust. in Appendix.