02-structure%20%26%20function%20of%20ns

02-structure%20%26%20function%20of%20ns - Everything you...

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Unformatted text preview: Everything you ever wanted to know about the nervous system in two easy lessons. Nerve cells (neurons) are the building blocks of the nervous system. (glial cells) bifurcation Structure of an idealized neuron: The contacts between neurons are called synapses The “innards” of the soma: (ATP) Cytoplasm and organelles. Different types of synapses 4. Synapse on terminal button from another cell 1. Synapse on smooth dendrite 2. Synapse on dendritic spine 3. Synapse on soma (cell body) Structure of a synapse Neurotransmitter being released into synaptic cleft Synaptic vesicle presynaptic neuron postsynaptic neuron Electrical currents in neuronal membranes are caused by the movement of electrically charged atoms (ions ) in and out of the cell – through ion channels . Na + K + Some neurotransmitters bind to receptor sites on the outside end of ion channels and cause them to open or close. Sequential opening and closing of ion channels change the electrical potential across the neuronal cell membrane and generate an action potential . The axon hillock integrates excitatory postsynaptic potentials (EPSP’s ) and inhibitory postsynaptic potentials (IPSP’s...
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This note was uploaded on 03/04/2009 for the course PSYCH 335 taught by Professor Georgewade during the Fall '08 term at UMass (Amherst).

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02-structure%20%26%20function%20of%20ns - Everything you...

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