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Chap. 9 Vocab

Michael Haley

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Across
6.any cell that covers the nerve fibers in the peripheral nervous system and forms the myelin sheath.
11.neurochemical that transmits nerve impulses across a synapse.
16.organ or cell that acts in response to a stimulus.
18.supporting structure of nervous tissue.
21.part of the nervous system responsible for control of the bodily functions not consciously directed.
24.organ having nerve endings (in the skin or viscera or eye or ear or nose or mouth) that respond to stimulation.
26.cell of the oligodendroglia.
27.nerve fiber that carries impulses toward the central nervous system.
Down
1.tructure containing a number of nerve cell bodies, typically linked by synapses, and often forming a swelling on a nerve fiber.
2.nervous system outside the brain and spinal cord.
3.neuroglial tissue of mesodermal origin that can become phagocytic
4.complex of nerve tissues that controls the activities of the body.
5.part of the peripheral nervous system associated with the control of body movements.
7.whitish fiber or bundle of fibers that transmits impulses of sensation to the brain or spinal cord, and impulses from these to the muscles and organs.
8.nerve fiber that carries impulses toward the muscles or glands.
9.Cell which lines the ventricles (fluid-filled spaces in the brain).
10.electrical potential of a neuron or other excitable cell relative to its surroundings when at rest.
12.layer of myelin encasing (and insulating) the axons of medullated nerve fibers.
13.junction between two nerve cells, consisting of a minute gap across which impulses pass by diffusion of a neurotransmitter.
14.threshold potential is the membrane potential to which a membrane must be depolarized to initiate an action potential.
15.change in electrical potential associated with the passage of an impulse along the membrane of a muscle cell or nerve cell.
17.gap in the myelin sheath of a nerve, between adjacent Schwann cells.
19.specialized cell transmitting nerve impulses.
20.portion of a nerve cell that contains the nucleus but does not incorporate the dendrites or axon.
22.short branched extension of a nerve cell.
23.star-shaped glial cell of the central nervous system.
25.long threadlike part of a nerve cell along which impulses are conducted from the cell.

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