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How many neurons does a human brain contain?

Cholinergic neuron

Extended amygdala

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Journal Article•DOI Not all brains are made the same: new views on brain scaling in evolution. Suzana Herculano-Houzel 01 Jan 2011-Brain Behavior and Evolution 126 Citations	As a result, while brain size can no longer be considered a proxy for the number of brain neurons across mammalian brains in general, it is actually a very good proxy for the number of nonneuronal cells in the brain.
Journal Article•DOI Percentage of relay and intrinsic neurons in two sensory thalamic nuclei projecting to the non-cortical telencephalon in reptiles Caiman crocodilus. Michael B. Pritz, Mark E. Stritzel - Show less +1 more 18 Jun 1986-Brain Research 14 Citations	These data suggest that each of these thalamic nuclei contain few, if any, intrinsic or local circuit neurons.
Journal Article•DOI Quantification of cholinergic and select non-cholinergic mesopontine neuronal populations in the human brain. Kebreten F. Manaye, R.M Zweig, Donghai Wu, Louis B. Hersh, S. De Lacalle, Clifford B. Saper, Dwight C. German - Show less +6 more 01 Mar 1999-Neuroscience 99 Citations	The present study provides detailed maps of the distribution and number of mesopontine cholinergic neurons in the normal human brain.
Journal Article•DOI Topography of neurons expressing luteinizing hormone-releasing hormone gene transcripts in the human hypothalamus and basal forebrain. Naomi E. Rance, W. Scott Young, Nathaniel T. McMullen - Show less +2 more 22 Jan 1994-The Journal of Comparative Neurology 93 Citations	We report a much wider distribution and greater numbers of LHRH neurons than have been previously described in the human brain.
Journal Article•DOI Neurons from fetal rat brain in a new cell culture system: a multidisciplinary analysis. Earl W. Godfrey, Phillip G. Nelson, Bruce K. Schrier, Anthony C. Breuer, Bruce R. Ransom - Show less +4 more 06 Jun 1975-Brain Research 124 Citations	This new approach will allow, in culture, detailed multidisciplinary analyses of individual neurons and small networks of neurons from the mammalian brain.

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