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Unformatted text preview: Neuroscience 302 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 Research started with the compound microscope o Thin slices (not much diameter) for research o Brain tissue like jello not firm enough to make slices Early 19 th Century 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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- Fall '10