文档介绍：(Sinclair,S.,1985;Burrows,M.,1996;Williams,,K.,1988)腦佔全身體重之比例(human)約2%AveragebrainwidthAveragebrainlengthAveragebrainheight(150poundhuman)約140mm約167mm約93mmAveragenumberofneuronsinthebrain(human)約100billion%ofbrainthatiswhitematter=60%%ofcerebraloxygenconsumptionbywhitematter=6%%ofbrainthatisgraymatter=40%%ofcerebraloxygenconsumptionbygraymatter=94%Averagenumberofglialcellsinbrain=10-50timesthenumberofneurons(Formoreonthenumberofneuronsinthebrain,,,11:423-453,1988)Numberofneuronsinbrain(octopus)約300millionNumberofneuronsinAplysianervoussystem約18,000-20,(ingrams)SpeciesWeight(g)adulthuman 1,300-1,400(about3pounds)newbornhuman350-400spermwhale7,800finwhale6,930elephant6,000humpbackwhale4,675graywhale4,317killerwhale5,620bowheadwhale2,738pilotwhale2,670bottle-noseddolphin1,500-1,600walrus1,020-1,126PithecanthropusMan850-1,000camel762giraffe680hippopotamus582leopardseal542horse532polarbear498gorilla465-540cow425--97dog(beagle)72aardvark72beaver45cat30porcupine25squirrelmonkey22marmot17rabbit10-