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Chapter 7 -The Nervous System
Across
3. Mechanism that inhibits passage of materials from the blood into brain tissues; reflects relative impermeability of brain capillaries.
8. Automatic reaction to stimuli.
9. Efferent division of the peripheral nervous system that innervates cardiac and smooth muscles and glands; also called the involuntary or visceral motor system.
11. Gray area of the central nervous system; contains cell bodies and unmyelinated fibers of neurons.
12. Nerve cell that carries impulses toward the central nervous system; initiates nerve impulses following receptor stimulation.
13. Fatty insulating sheath that surrounds all but the smallest nerve fibers.
15. Division of the peripheral nervous system that provides the motor innervation of skeletal muscles; also called the voluntary nervous system.
16. Movement of the membrane potential to the initial resting (polarized) state.
17. Neuron process that carries impulses away from the nerve cell body; efferent process; the conducting portion of a nerve cell.
18. Nonexcitable cells of neural tissue that support, protect, and insulate the neurons.
Down
1. A collection of nerve fibers in the central nervous system having the same origin, termination, and function.
2. Receptor located in a joint, muscle, or tendon; concerned with locomotion, posture and muscle tone.
4. Outermost and toughest of the three membranes (meninges) covering the brain and spinal cord.
5. A large transient depolarization event, including polarity reversal, that is conducted along the membrane of a muscle cell or a nerve fiber.
6. neurons that conduct impulses away from the central nervous system.
7. Loss of a state of polarity; loss or reduction of negative membrane potential.
10. Weblike; specifically, the weblike middle layer of the three meninges.
14. Cell of the nervous system specialized to generate and transmit nerve impulses.