| A | B |
|---|
| Central Nervous System | consists of the brain and sprinal cord |
| Peripheral Nervous System | the nervous system outside the CNS; consists of nerves |
| Afferent division | nerve fibers that convey messages to the CNS |
| Efferent division | transmits impulses from the CNS to effector organs |
| Somatic Nervous System | motor nerves that conduct impulses from the CNS to skeletal muscles |
| Autonomic Nervous System | motor nerve fibers that regulate the activity of smooth muscles, cardiac muscles, and glands |
| Neurons | nerve cells; highly specialized cells that conduct messages in the form of impulses |
| Cell body | part of neuron that contains the nucleus |
| Processes | nerve fibers; extend from the cell body |
| Dendrites | function as the receptive sites; branched extensions |
| Axon | impulse generators and conductors; transmit nerve impulses away from the cell body |
| Schwann cell | forms myelin sheaths around nerve fibers; insulate the nerve |
| Neurofibrils | bundles of microtubules important in intracellular transport |
| Tracts | a bundle of neuron processes in the CNS |
| Nerves | bundle of neuron processes in the PNS |
| Myelin sheath | protects and electrically insultes fibers; formed by Schwann cells |
| Multipolar neurons | have numerous branching dendrites and one axon |
| Bipolar neurons | cell body located in the middle; between the dendrites and axon |
| Unipolar neuron | cell body found attached to process with dendite and axon on the ends |
