The Allied Powers, or Allies, refers to coalitions of primarily North American nations victorious over rival, central-European forces in World War I and World War II. The four nations that recurred...
Structure. The nervous system is divided into two parts: 1  the central nervous system consisting of the brain and spinal cord. 2  These structures are protected by bone and cushioned from injury by the cerebrospinal fluid (CSF). 3  the peripheral system which connects the central nervous system to the rest of the body. Sensory nerves gather information from inside the body and the outside environment. 2  The nerves then carry the information to central nervous system (CNS). 3  Sensory information brought to the CNS is processed and interpreted. 4  Motor nerves convey information from the CNS to the muscles and the glands of the body.
The autonomic system has two divisions. It consists of the sympathetic and parasympathetic nervous systems. The primary function of the sympathetic system is to stimulate your fight-or-flight response which is a physiological reaction that happens in response to a perceived harmful event, attack or threat to survival. The parasympathetic system enables you to maintain normal functions such as digesting and keeping the body at rest. The Structure of the Sympathetic Nervous System. Transmission of signals in the system is accomplished through a network of nerve cells called neurons.