BISC 230Lgx Lecture Notes - Lecture 3: Myelin, Schwann Cell, Autoimmune Disease
8 Apr 2016
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Neurons: 100 billion neurons carry out the brain"s major funcions. Non-neurons/glial cells: 400 billion supporive cells that modulate neuron behavior. Chocolate chip cookie analogy: neurons are chocolate chips, dough is the glia, raio is 1:4 o o o o o o o o. Brain is 15 cm from front to back. Cortex is 3mm thick, but scrunched up so if laid lat, it would be 1 sq foot. A single neuron is 100 micrometers (. 1 mm), studied at 100x magniicaion. Parts of neurons are studied at 1000x magniicaion. Axon terminal is about 1 picometer in diameter, studied at 10,000x magniicaion. Neuronal membrane - 5 nm thick, studied at 106. Ion channel - . 5 nm, about ten million imes smaller than the brain as a whole. Input zone: o informaion comes from other cells through dendrites. Integraion zone- cell body or soma and synapse hillock: o region where inputs are summed.
