NERVOUS SYSTEM

2. Lipid-rich sheath that insulates axons and speeds conduction.
4. Star-shaped glial cells that support neurons and form the blood-brain barrier.
8. Structural and functional unit of the nervous system.
9. Dense connective tissue layer surrounding a whole peripheral nerve.
12. Neurotransmitter primarily responsible for excitatory signaling in the CNS.
14. Immune defense cells of the CNS.
15. Rapid conduction in myelinated fibers.
16. Gap between presynaptic and postsynaptic cells.
17. Region of neuron specialized for receiving input.
18. Site of action potential initiation in neurons.
19. Glial cells lining ventricles that produce cerebrospinal fluid.

1. Neuronal pigment granule that accumulates with age.
3. Large pyramidal neurons found in the cerebral cortex motor areas.
4. Long process that carries impulses away from soma.
5. Handling thought, emotion, learning, and memory.
6. SPACE Space between arachnoid and pia mater filled with CSF.
7. Protein that stabilizes microtubules in axons; abnormal forms found in Alzheimer’s disease.
10. Fibrous connective tissue covering bundles of axons in a peripheral nerve.
11. DISCS Specialized junctions between cardiac muscle cells, allowing impulse conduction.
13. Ion channel type that opens in response to depolarization.