Nervous System

4. major structure of the hindbrain that is located near the brainstem
5. a control system that acts largely unconsciously and regulates bodily functions
7. anterior portion of the brain
8. the nervous system outside of the brain and spinal cord
11. the positively charged central core of an atom
14. organ that controls all functions of the body
16. the nerve cells that are activated by sensory input from the environment
17. a junction between two nerve cells
21. this system directs the body's rapid involuntary response to dangerous or stressful situations
22. a neuron which transmits impulses between other neurons
23. a specialized cell transmitting nerve impulses
24. responsible for the body's rest and digestion response when the body is relaxed, resting, or feeding
25. the part of the peripheral nervous system associated with the voluntary control of body movements via skeletal muscles

1. a chemical substance that is released at the end of a nerve fiber by the arrival of a nerve impulse
2. spherical part of the neuron that contains the nucleus.
3. these nerves branch from your lower back through your hips and buttocks and down each leg
6. allows electrical impulses to transmit quickly and efficiently along the nerve cells.
9. a short branched extension of a nerve cell
10. a neuron whose cell body is located in the motor cortex, brainstem or the spinal cord
12. bundle of fibers that transmits impulses of sensation to the brain or spinal cord, and impulses from these to the muscles and organs
13. long tubelike structure that begins at the end of the brain stem and continues down to the bottom of the spine
15. these nerves aid in the contraction of muscles as well as provide sensory information from the skin
18. the network of nerves that sends signals from your spinal cord to your shoulders, arms and hands
19. neuron that conducts electrical impulses
20. consists of the brain and the spinal cord