2. Two functions of the nervous system a. Somatic, voluntary movement b. autonomic, involuntary movement

3. The central nervous system contains the brain and the spinal cord.

4. The peripheral nervous system- Consists of all nerves on the edge of or outside of the CNS.

5. Parts of the rat brain

6. Function of intervertebral disks- Cushions and protects the spinal cord and vertebrae.

7. Cells of the nervous system Neurons and ganglia

8. Types of neurons Neurons come in many sizes. For example, a single sensory neuron from your fingertip has an axon that extends the length of your arm, while neurons within the brain may extend only a few millimeters. They also have different shapes depending on their functions. Motor neurons that control muscle contractions have a cell body on one end, a long axon in the middle and dendrites on the other end. Sensory neurons have dendrites on both ends, connected by a long axon with a cell body in the middle. Interneurons, or associative neurons, carry information between motor and sensory neurons.

9. Parts of a neuron

10. Function of neuron parts A Cell body- Produces proteins B nucleus- Information, DNA C Dendrites- receive signals from other nerves D axon- sends messages E Myelin sheath-protects axon F Nodes of Ranvier- cause impulses to move more quickly along the neuron G Axon terminals contain neurotransmitters make contact with other nerves

11. How a neuron works