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Microtome for cutting ultrathin tissue sections
Page 5
Panulirus interruptus, the California spiny lobster
Stomatogastric ganglion
Page 7
Synaptic contacts within a small region of nervous tissue
Page 8
Shape of one nerve cell
(in lobster stomatogastric ganglion)
Page 9
Reconstructing cell shape from sections
Page 13
Drosophila melanogaster, the laboratory fruit fly
Page 15
Head
Thorax
Abdomen
the cardia in the fly digestive tract
Page 26
Elaboration of cardia structure, along the main line of fly evolution
Page 27
in cross section of fly nerve cord“Giant” nerve fibers ( * )
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Giant fibers conduct signals from antennae to flight muscles.
Page 30
Fly species differ in their distributions of nerve-fiber diameter.
Tipulidae, Tipula bicornis Forbes Lauxaniidae, Minettia magna (Coquillett)
Tabanidae, Tabanus calens Linnaeus Syrphidae, Helophilus fasciatus Walker
Bombyliidae, Sparnopolius sp. Bombyliidae, Poecilanthrax sp.
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How can evolution adjust the properties of individual nerve cells?
Page 32
Charles Darwin Letter to T.H. Huxley 1859
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?