PSYC 107 Lecture Notes - Lecture 8: Axon Hillock, Myelin, Voltage Spike
15 May 2016
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Cortex=outside; lobes w/diff. processes: lobes are separated by fissures. 2 hemispheres: left and right: thalamus: info. from sensory receptors comes here 1st before going out to rest of brain, hippocampus: important/staging area for mems, amygdala: responsible for our emotional experiences. Brain cell=neuron=nerve cell (picture labeling on test 3***: always have axons, dendrites, and soma (cell body) @ end of axon=arborizations terminal buttons contain vesicles (small containers) w/chems. of neural transmitters: myelin sheath: gaps w/nodes of ranvier. Neuron=electrochem. device: electric signal moving along axon=action potential=electrical signal; propagates; doesn"t flow like electrons in a wire, terminal buttons cause release of vesicles of neural transmitters=how. Nodes of ranvier: gaps where ions can move in/out of neuron: spike=sodium(+) ions rushing in, downward spike=potassium(+) rushing out. Hyperpolarization: changes in potential moving away from threshold (a bunch of negatives) Neurons=cells that make up brain=electrochem. devices: form network of cells, but don"t touch each other.
