| A | B |
|---|
| central nervous system | controls all basic bodily functions, and responds to external changes |
| peripheral nervous system | provides a complete network of motor and sensory nerve fibers connecting the central nervous system to the rest of the body |
| autonomic nervous system | parallels spinal cord but is separately involved in control of exocrine glands, blood vessels, viscera and external genitalia |
| brain and spinal cord | make up the central nervous system |
| cranial nerves and spinal nerves (voluntary) | make up the peripheral nervous system |
| nerve | is a group or bundle of fibers located outside the central nervous system that connect the brain and spinal cord with various parts of the body |
| afferent neurons | carry impulses to the brain and spinal cord from the skin and sense organs. |
| dendrites | branched process of a neuron that receives impulses and carries them to the cell body |
| efferent neurons | carry impulses away from the brain and spinal cord to the muscles and glands |
| ganglion | knotlike mass of nerve tissue located outside the brain and spinal cord |
| impulse | wave of sudden excitement |
| stimulus | something that activates or excites the nerve and results in an impulse |
| neuron | basic, individual, microscopic serve cell |
| tract | actual bundle of fibers within the system |
| gray matter | unsheathed or uncovered cell bodies and dentrites |
| white matter | myelinated nerve fibers |
