Decades: 520s BC 510s BC 500s BC 490s BC 480s BC - 470s BC - 460s BC 450s BC 440s BC 430s BC 420s BC
476 BC 475 BC 474 BC 473 BC 472 BC - 471 BC - 470 BC 469 BC 468 BC 467 BC 466 BC
... the ugliest diagram on wikipedia, go ahead, redo it :-)
I drew the spinal cord in OOo Draw, but did the rest in photoshop. (without using any line ...
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