Nervous system crossword

1. part of a neuron; collects information from dendrites, passes them along
3. bundle of nerve fibers held together by layers of connective tissue
7. attach to it
8. of cell in the PNS that surrounds a fiber forming the myelin sheath
10. that contract and glands that secrete when stimulated by nerve impulses
12. potential decreases, inside of cell becomes less negative
13. end of an axon leading to the synaptic knob
15. in the myelin sheath between schwann cells over axon
17. consists of the brain and spinal cord
20. of time necessary for an axon to return to resting potential so it can be stimulated again
21. pathway that has few neurons
24. between two neurons that the impulse jumps through
27. of neurotransmitters from an axon terminal to a dendrite
29. of a neuron that receives information from cells
30. of an electrical signal along an axon
32. nerve impulses out of the brain or spinal cord to effectors, stimulate muscles to contract
33. where impulses travel from neuron to neuron

1. external and internal changes
2. that carry information through the nervous system
4. postsynaptic membrane permeability to sodium ions
5. of lipid proteins
6. nerves that connect the CNS to other body parts
9. only within brain or spinal cord, transmit impulses f
11. at the end of an axon that holds and secretes neurotransmitters
14. to memory, translates sensations into perceptions, causes us to make conscious or subconscious decisions
16. insulating layers of myelin around axons within the CNS
18. path nerve impulses travel thru the nervous system
19. that carry impulses to effectors from CNS
22. of neuron that carries impulses away from the cell body
23. masses of nervous tissue, located outside the brain
25. between two communicating neurons
26. neurons are used to act upon the results of sensory and integrated functions
28. neurons and phagocytize bacterial cells
30. potential difference between the area inside the cells and the area outside of the cell
31. formed from schwann cells