General+Divisions+of+the+Nervous+System

The nervous sysem is a network of nerve cells that carry messages called impulses. One main part of the nervous system is the stimuli which is anything that causes a receptor to start impulses in a nerve pathway. Recepors are important because their specialized structures sensitive to certain stimuli. 1 example are sense organs. The effectors respond to certain stimulus. Some examples are muscles or glands. A neuron is a crucial part that makes up the nervous system. 3 parts of the neuron is the cyton or the cell body which contains the nucleus and the structure of the neuron and dendrites which are short highly branched fibers. Axon- long, thin fiber that extends from the cell body Synapse- the region where nerve impulses pass from one neuron to another THREE TYPES OF NEURONS The central nervous system is composed of the brain and the spinal cord. It is protected by the skull and back bone. The central nervous sytem sends messages from your brain all the way down to your spinal cord Peripheral Nervous system is made up of all the nurons and nerve fibers outside the brain and spinal cord
 * General Divisions of the Nervous System**
 * carry impulses extends from the cell body
 * send impulses to other neurons or fectors
 * 1) Sensory Neurons- carry impulses from receptors to the spinal cord and brain
 * 2) Interneuron- relay impulses fro one neuron to another in the brain and spinal cord
 * 3) Motor Neurons- carry impulses from the brain and spinal cord to effectors, usually muscles
 * __CENTRAL NERVOUS SYSTEM,__**
 * __PERIPHERAL NERVOUS SYSTEM__**