![]() ![]() 322), the record for time awake is attributed to Mrs. World record, time without sleep = 264 hours (11 days) by Randy Gardner inġ965. Thickness of cerebral cortex (Bottlenosed dolphin) =ġ.3-1.8 mm (S.H. Temporal lobe = 22% parietal lobe = 19% occipital lobe = 18%. Percentage of total cerebral cortex volume (human): frontal lobe = 41% Information Processing in Single Neurons, New York: Oxford Univ. Koch lists the total synapses in theĬerebral cortex at 240 trillion ( Biophysics of Computation. Shepherd, The Synaptic Organization of theīrain, 1998, p. Total number of synapses in cerebral cortex = 60 trillion (yes, trillion) Neurons in the cerebral cortex at 20 billion ( Biophysics ofĬomputation. Total number of neurons in cerebral cortex = 10 billion ( from G.M. and Nicholson, C., The Central nervous System (Reference for surface area figures: Nieuwenhuys, Total surface area of the cerebral cortex (false killer whale) = 7,400 Total surface area of the cerebral cortex (pilot whale) = 5,800 Total surface area of the cerebral cortex (Bottlenosed dolphin) = Total surface area of the cerebral cortex (African elephant) = 6,300 Total surface area of the cerebral cortex (cat) = 83 cm 2 Total surface area of the cerebral cortex (rat) = 6 cm 2 Total surface area of the cerebral cortex (lesser shrew) = 0.8 Total surface area of the cerebral cortex = 2,500 cm 2 (2.5įt 2 A. The Central Nervous System, Edinburgh: Churchill Livingstone, Million MORE neurons on left side than right side (Pakkenberg et al., ![]() Number of synapses in cortex = 0.15 quadrillion (Pakkenberg et al.,ĭifference number of neurons in the right and left hemispheres = 186 Length of myelinated nerve fibers in brain = 150,000-180,000 km Number of neurons in cerebral cortex (rat) = 21 million (Korbo, L., etĪl., J. Number of neocortical neurons (males) = 22.8 billion (Pakkenberg et al.,Īverage loss of neocortical neurons = 85,000 per day (~31 million perĪverage loss of neocortical neurons = 1 per second (Pakkenberg et al.,Īverage number of neocortical glial cells (young adults ) = 39 billionĪverage number of neocortical glial cells (older adults) =36 billion Neocortical neuron number in humans: effect of sex and age. et al., Aging and the human neocortex, Exp. Number of neocortical neurons (females) = 19.3 billion (Pakkenberg, B. (For more information about the number of neurons in the brain, see R.W. Ratio of glial cells to neurons in the brain = 1:1 Reference) ![]() % of cerebral oxygen consumption by gray matter = 94% % of cerebral oxygen consumption by white matter = 6% Image analyser, Neuropathol Appl Neurobiol., 6:119-132, White matter in the cerebral hemispheres of man: measurements with an and Corsellis, J.A., Variation with age in the volumes of grey and Ratio of the volume of grey matter to white matter in the cerebral The Neurobiology of the Insect Brain, Burrows, M., 1996) Volume of the brain of a locust = 6mm 3 (from Number of neurons in each segmental ganglia in the leech = 350 Number of neurons in Aplysia nervous system = 18,000-20,000 Number of neurons in honey bee brain = 950,000 ( from Menzel, R. et al., The octopus: a model for a comparative analysis of theĮvolution of learning and memory mechanisms, Biol Bull., 210:308-317, 2006.) 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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