Lesson 6.4 Crossword
Across
1. | the parasympathetic nervous system, in which nerves originate in the brain stem or sacral region of the spinal cord |
5. | a neurotransmitter released by postganglionic neurons in the sympathetic nervous system |
6. | the anterior division of spinal nerves that communicate with the muscle and skin of the anterior and lateral trunk |
7. | a mass of nervous tissue composed mostly of nerve-cell bodies |
8. | 12 pairs of nerves that originate in the brain and relay impulses to and from the PNS |
9. | the tough outer covering of a nerve |
10. | a delicate, connective tissue that surrounds each nerve fiber |
11. | complex interconnections of nerves |
12. | the sympathetic system of nerves that lies near the thoracic and lumbar regions of the spine |
Down
2. | the division of posterior spinal nerves that transmit motor impulses to the posterior trunk muscles and relay sensory impulses from the skin of the back |
3. | neural transmitters that branch from the left and right sides of the spinal cord |
4. | a protective sheath that surrounds a bundle of nerve fibers |