1860FW12L3 -Localization and its Critics

Fredrich goltz 1834 1902 argued no specific defect

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Fredrich Goltz (1834-1902) Argued no specific defect when sensory and motor areas removed in dogs Live dog still had functions Committee felt enough brain material was left behind to account for function
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Electrophysiology of Brain Richard Caton (1842- 1926) records spontaneous electrical currents from animal brains Variation of current with chewing, recorded from this motor area Light (sensory ) to eyes changes current in region associated with eyelid
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Cytoarchitectonics fine anatomy of cortex Thickness of cortex Arrangements of cells Cell types Shapes of cells staining Korbinian Brodmann (1909) produces a
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Cell Theory, 1839 Based on microscopy Theodor Schwann (1810-1882) proposes that all body tissues are made of individual cells Not accepted for nerve tissue until much later “axis cylinder“ and cell body and dendrites identified
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Neuron Doctrine Discovery that nerve cells (neurons) are independent entities, and not fused to each other Depended on critical advances in microscopy Staining (Golgi method, or Black Reaction) Achromatic microscopes (1826) Why would this doctrine affect the acceptance of localization theory?
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Achromatic Lens Look through different microscopes here
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Camillio Golgi‘s (1843-1926) Stain (silver nitrate) 1873 A certain number (not all) of neurons in sample are stained fully Whole nerve cell can be seen Dendrites and branches Cell body Axon The Hippocampus, by Golgi
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Neural Reticulum Theory Theory that neurons are interconnected in large webs through large regions of the brain Localization of function would not be possible if nerve cells are connected in this way 2nd and 3rd quarters of 19th century Evidence from examination of cells led neuroscience community toward neuron theory
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Spinal nerve branches seem to form fused nets Kölliker, 1867 shows interconnections that allow nerve cells to communicate
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Net or Not?
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