BIO188_Outline_Nov2

BIO188_Outline_Nov2 - BIO 188 BIO November 2, 2009 Today: o...

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BIO 188 November 2, 2009 BIO 188 November 2, 2009 Today: o basic terminology o basic principles of nervous systems o neuron anatomy o begin membrane potential and action potentials Which represents a known signaling pathway? Not all details are included but major events should be present in the correct sequence Let’s start w/ really basic nervous system terminology What are the two categories of cells in NS? Neurons Neurons . What do they do? Transfer a signal, send electrical message (signaling). o detect, generate, propagate and transmit action potentials Glial cells (glia) do not fire action potentials but Glial cells (glia) do not fire action potentials but have diverse actions incl: o physical support, protection o metabolic support o electrically insulate axons with myelin o maintain extracellular environment o source of new neurons How is information passed from neuron to neuron? At a synapse synapse o chemical chemical synapses use neurotransmitters and receptors 1 ° means of communication o electrical synapses pass ions via gap junctions gap junctions The pre pre synaptic neuron sends message The post post synaptic neuron receives message
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Neurons are organized in networks or neural circuits neural circuits , so they are almost always both pre- pre- and post- post- synaptic Some more really basic nervous system terminology What do we call neurons that carry information into the nervous system, towards the brain, or to higher brain centers?. . afferent neurons (example sensory neurons) o .. .. What do we call neurons that carry commands to effectors, or carry information from “higher” brain regions to brainstem? . . efferent neurons. Why do animals need a nervous system?
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BIO188_Outline_Nov2 - BIO 188 BIO November 2, 2009 Today: o...

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