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

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

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Everything you ever wanted to know about the nervous system in two easy lessons.
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Nerve cells (neurons) are the building blocks of the nervous system. (glial cells) bifurcation Structure of an idealized neuron:
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The contacts between neurons are called synapses
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The “innards” of the soma: (ATP) Cytoplasm and organelles.
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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)
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Structure of a synapse Neurotransmitter being released into synaptic cleft
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Synaptic vesicle
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presynaptic neuron postsynaptic neuron
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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 +
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Some neurotransmitters bind to receptor sites on the outside end of ion channels and cause them to open or close.
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Sequential opening and closing of ion channels change the electrical potential across the neuronal cell membrane and generate an action potential .
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The axon hillock integrates excitatory postsynaptic potentials (EPSP’s ) and inhibitory postsynaptic potentials (IPSP’s
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