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SIU SOM Logo. Microtome for cutting ultrathin tissue sections. Panulirus interruptus , the California spiny lobster. Stomatogastric ganglion. Synaptic contacts within a small region of nervous tissue. Shape of one nerve cell (in lobster stomatogastric ganglion).

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  1. SIU SOM Logo

  2. Microtome for cutting ultrathin tissue sections

  3. Panulirusinterruptus, the California spiny lobster Stomatogastric ganglion

  4. Synaptic contacts within a small region of nervous tissue

  5. Shape of one nerve cell (in lobster stomatogastric ganglion)

  6. Reconstructing cell shape from sections

  7. Drosophila melanogaster, the laboratory fruit fly

  8. Thorax Abdomen Head the cardia in the fly digestive tract

  9. Elaboration of cardia structure, along the main line of fly evolution

  10. “Giant” nerve fibers ( * ) in cross section of fly nerve cord

  11. Giant fibers conduct signals from antennae to flight muscles.

  12. Drosophila melanogaster Muscina pascuorum Minettia magna

  13. Tipulidae, TipulabicornisForbesLauxaniidae, Minettia magna (Coquillett) Tabanidae, TabanuscalensLinnaeusSyrphidae, HelophilusfasciatusWalker Fly species differ in their distributions of nerve-fiber diameter. Bombyliidae, Sparnopoliussp.Bombyliidae, Poecilanthraxsp.

  14. How can evolution adjust the properties of individual nerve cells?

  15. One point which has greatly troubled me; . . . what the devil determines each particular variation? What makes a tuft of feathers come on a cocks head, or moss on a moss rose? Charles Darwin Letter to T.H. Huxley 1859

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