ch 3 notes III - Neurons and Neuronal Communication The...

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Neurons and Neuronal Communication
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The Neuron Complexity of the brain The brain contains 100 billion neurons Average of 10,000 connections for each neuron 10,000,000,000,000 (10 trillion) neural connections! Born with all of the neurons for your lifetime* Pruning *except some new growth in memory structures The brain’s connections change w/experiences
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The Neuron: Structure
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A neuron sends axon terminals to 1000’s of other neurons PRESYNAPTIC NEURON POSTSYNAPTIC NEURON
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Neural Impulse Overview Communication pathway: Neural impulse in the presynaptic neuron triggers release of neurotransmitter, which triggers a neural impulse in the post-synaptic neuron
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The Neuron at Rest Neurons are NEVER INACTIVE: Neurotransmitter (“ligand”) constantly binds w/receptors, which open, and sodium rushes inside the neuron During Resting Potential: The neuron is “polarized” with a relatively more negative charge (ions) inside and positive charge (ions) outside.
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The Neural Impulse: From
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