lecture 31...lecture - Lecture 31: How Neurons Work -the...

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Lecture 31: How Neurons Work -the need for speed * hormones: delays of seconds or minutes or moree * electrical action potentials: milliseconds * needed by organisms that escape from predators, large, captgure food, respond quickly to any environmental change -most staining techniques reveal the nervous system to be a jumbled network of interconnected fibers -neuron doctrine: nervous system is composed of cells Santiago Ramon y Cajal…use of golgi stain shows individual cells from cerebullum … golgi stained neuron from optic lobe of a fly by strausfield 1- anatomy of a neuron 2- resting potential 3- action potential: ionic basis 4- action potential: propagation -neurons are typically bipolar …dendrites “input”… cel body… axon with terminals (outpu) -in vertebrates. Arge axons are surrounded by myelin neuroglia (or glia): 10-50x more than the # of neurons in mammalian CNS -oligodendrocytes (CNS) and Schwann cells (PNS): myelin sheath -other glia cells: support, nutrition, metabolic functions, guide axon dev, learning
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lecture 31...lecture - Lecture 31: How Neurons Work -the...

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