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Across 1. nerve fiber that carries impulses toward the central nervous system. 5. any cell that covers the nerve fibers in the peripheral nervous system and forms the myelin sheath. 8. an organ having nerve endings (in the skin or viscera or eye or ear or nose or mouth) that respond to stimulation) 12. A specialized cell transmitting nerve impulses; a nerve cell 13. organ or cell that acts in response to a stimulus 14. A junction between two nerve cells, consisting of a minute gap across which impulses pass by diffusion of a neurotransmitter. 16. Carrying impulses from the central nervous system to an effector 17. he soma (pl. somata or somas), or perikaryon (pl. perikarya), or cyton, is the bulbous end of a neuron, containing the cell nucleus 18. A whitish fiber or bundle of fibers that transmits impulses of sensation to the brain or spinal cord, 19. neuroglial tissue of mesodermal origin that can become phagocytic 20. change in electrical potential associated with the passage of an impulse along the membrane of a muscle cell or nerve cell. 21. part of the peripheral nervous system associated with the control of body movements 22. A chemical substance that is released at the end of a nerve fiber by the arrival of a nerve impulse 23. cell of the oligodendroglia 25. part of the nervous system responsible for control of the bodily functions not consciously directed, such as breathing 26. ayer of myelin encasing (and insulating) the axons of medullated nerve fibers

Down 2. gap in the myelin sheath of a nerve, between adjacent Schwann cells 3. The nervous system outside the brain and spinal cord 4. large neuroglia cells of nervous tissue 6. The electrical potential of a neuron or other excitable cell relative to its surroundings when at res 7. a class of cells in the brain and spinal cord that form a supporting structure for the neurons and provide them with insulation. 9. membrane potential to which a membrane must be depolarized to initiate an action 10. short branched extension of a nerve cell, along which impulses received from other cells at synapses are transmitted to the cell body. 11. complex of nerve tissues that controls the activities of the body. In vertebrates it comprises the brain and spinal cord 15. thin epithelial membrane lining the ventricular system of the brain and the spinal cord 20. ong threadlike part of a nerve cell along which impulses are conducted from the cell. 24. A structure containing a number of nerve cell bodies, typically linked by synapses, and often forming a swelling on a nerve fiber