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Unformatted text preview: Neuroscience 302 à Chapter 2- Neurons and Glia • Intro: neurons vs. glia • Glia/Glial cells- contribute to brain function by insulating, supporting, and nourishing neighboring neurons o Keep the brain neurons stuck together o Outnumber neurons ten-fold • Neurons-sense changes in the environment, communicate changes to other neurons, and command bodies responses to the sensations o Perform bulk of brain information processing o Therefore 90% of attention to 2% of brain cells • Neuron Doctrine • Average cell≈ 0.01-0.05 mm diameter o Tip of unsharpened pencil 2mm across Neurons = 40-200x smaller • Cannot be seen with naked eye! • Late 17 th Century à Research started with the compound microscope o Thin slices (not much diameter) for research o Brain tissue à like jello à not firm enough to make slices • Early 19 th Century à scientists discussed how to harden aka “fix tissues” by immersing them in formaldehyde o Made special device called microtome to make thin slices...
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This note was uploaded on 09/24/2011 for the course NEURO 302 taught by Professor Ritter during the Fall '10 term at Washington State University .
- Fall '10