Nervous System

2. a detectable change in the physical or chemical structure of an organisms internal or external environment
4. receive a signal from the presynaptic terminal that triggers a change in the membrane potential of the neuron
6. Portion of a nerve that carries nerve impulses away from the cell body.
8. The complex of nerve tissues that control the activities of the body.
9. Any of the cells that hold nerve cells in place and help them work the way they should.
13. The part of the Nervous System that controls muscles of internal organs.
14. a gap in the myelin sheath of a nerve between adjacent schwann cells.
17. An insulating layer that forms around nerves.
19. A short branched extension of a nerve cell.
20. a specialized area of membrane of the axon terminal
21. whitish fiber or bundle of fibers that transmits impulses of sensation to the brain or spinal cord.
22. receives a signal from the presynaptic cell and responds via depolarisation
23. The nucleus containing central part of a neuron.
24. a sensory receptor which receives stimuli from within the body, especially one that responds to position and movement.
25. cells the main glial cells of the peripheral nervous system.

1. Small swellings that are found at the terminal ends of axons.
2. The voluntary nervous system.
3. The nervous system outside the brain and spinal cord.
5. the site of transmission of electric nerve impulses between two nerve cells.
7. A chemical substance that is released at the end of a nerve fiber by the arrival of a nerve impulse.
10. A neuron which transmits impulses between other neurons, especially as part of a reflex.
11. A structure containing a number of nerve cell bodies
12. A large granular body found in neurons.
15. Sensory neurons that carry nerve impulses.
16. Nerve cells that are fundamental units of the brain and nervous system.
18. Sensory neurons that carry nerve impulses from sensory stimuli towards the central nervous system and brain.