Chapter 7 Anatomy

1. The long part of a neuron that sends messages away from the cell body.
4. Cells in the nervous system that send and receive electrical messages.
6. The branched part of a neuron that receives signals from other cells.
7. The largest part of the brain; responsible for thinking, memory, senses, and voluntary movement.
9. Long extensions of neurons (usually axons) that carry electrical signals.
11. Bundles of nerve fibers (axons) that carry messages to and from the CNS.
12. Fluid-filled spaces in the brain that contain cerebrospinal fluid (CSF).
15. Controls involuntary actions like heartbeat, digestion, and gland activity.
17. An area of skin supplied by a single spinal nerve.
18. The brain and spinal cord; the body’s main control center.

1. An electrical signal that travels down an axon when a neuron “fires.”
2. All nerves outside the brain and spinal cord; connects the body to the CNS.
3. Support cells that protect, nourish, and clean up around neurons.
5. Carries commands from the CNS to muscles and glands.
8. Controls automatic survival functions like breathing, heart rate, and blood pressure.
10. A protective barrier that keeps harmful substances out of the brain while letting nutrients in.
13. Carries sensory information from the body to the CNS.
14. Three protective layers of tissue that cover the brain and spinal cord.
16. The small gap where one neuron communicates with another cell using chemicals (neurotransmitters).
19. A fatty coating around axons that helps messages travel faster.