Across
- 3. nervous system branch of the nervous system that controls involuntary body functions
- 5. nerves sensory transmitters that send impulses from receptors in the skin, muscles, and joints to the central nervous system
- 7. sheath the fatty bands of insulation surrounding axon fibers
- 8. cells glial cells that serve as cushioning support cells within the PNS
- 12. cells glial cells that form a protective covering around the spinal cord and central cavities within the brain
- 14. cells glial cells that wrap around the axons of some neurons in the PNS, providing them with a myelin sheath that speeds up their rate of transmission
- 15. nervous system (PNS) all parts of the nervous system external to the brain and spinal cord
- 18. glial cells that link neurons to capillaries and control the chemical environment to protect the neurons from any harmful substances in the blood
- 19. the processes through which the CNS receives and processes sensory input from the PNS and coordinates outgoing motor input
Down
- 1. glial cells that wrap around nerve fibers and produce a fatty insulating material called myelin to insulate some neurons
- 2. chemicals that act as messengers between an axon of one neuron and a dendrite on another, or between an axon and a muscle fiber
- 4. nervous system (CNS) the brain and spinal cord
- 6. nerves motor transmitters that carry impulses from the central nervous system out to the muscles and glands
- 9. nervous system branch of the nervous system that stimulates the skeletal muscles
- 10. the intersection between a neuron and another neuron, a muscle, a gland, or a sensory receptor
- 11. non-neural tissue that forms the interstitial or supporting elements of the CNS; also known as glial cells
- 13. branches of a neuron that collect stimuli and transport them to the cell body
- 16. neurons that form bridges to transmit nerve impulses between afferent and efferent neurons
- 17. glial cells that absorb and dispose of dead cells and bacteria