the network of nerve cells and fibres which transmits nerve impulses between parts of the body
a period of mental illness resulting from severe depression, stress, or anxiety
the part of the nervous system responsible for control of the bodily functions not consciously directed, such as breathing, the heartbeat, and digestive processes
the complex of nerve tissues that controls the activities of the body. In vertebrates it comprises the brain and spinal cord
the nervous system outside the brain and spinal cord