![]() Of these neurons located in the arms of the octopus. The octopus nervous system has about 500,000,000 neurons, with two-thirds Make the human brain an isometrically scaled-up primate brain. Of Neurosurgery, Edinburgh: Elsevier Mosby, 2005)Īverage number of neurons in the brain = 86 billion ( FredericoĪzevedo et al., Equal numbers of neuronal and nonneuronal cells and Ellenbogen, R.G., editors, Principles % brain of total body weight (150 pound human) = 2% Gross morphology functions, comparative anatomy, and evolution, Brain ![]() Quantitative development ofīrain and brain structures in birds (Galliformes and Passeriforms)Ĭompared to that in mammals (Insectivores and Primates). Nervous system to body metabolism in vertebrates: its constancy andįunctional basis. Theīiology of Carcharodon carcharias, San Diego: Academic Press, 1996. White shark: an evolutionary perspective. A Quantitative Handbook, New York: Plenum Press, 1968. Reference for many of these brain weights: These data were obtained from several textbooks. ![]() Brain Facts and Figures Brain Facts and Figures
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