Lesson 6.4 Crossword


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


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

G-W Learning