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| Property | Organism | Value | Units | ID | Details |
|---|---|---|---|---|---|
| Variability of size in brain (possibly only in forebrain) | Human Homo sapiens | ~15 - 20 | % above and below the mean values | 114631 | Haug H. Brain sizes, surfaces... |
| Concentration of glutamate in forebrain and cerebellum (about 50% less in various parts of brain stem) | Unspecified | 10 | µmol/g | 115056 | Krnjević, K. "Chemical... |
| Average number of dendritic spines | Zebra finch Taeniopygia guttata | 74±13 in HVCx: 51±7 in HVCra | Spines per cell | 107570 | Tschida KA, Mooney R.... |
| Number of neocortical neurons | Human Homo sapiens | ~2×10^10 | neurons/neocortex | 112054 | Drachman D (2005). "Do... |
| Average decrease in number of cortical neurons from age 20 to 90 | Human Homo sapiens | ~9.5 | % of neurons | 112057 | Drachman D (2005). "Do... |
| Degree of variability in macroscopic sizes of brain and cortex and in microscopic neuronal sizes | Human Homo sapiens | 15 - 20 | % above and below the mean | 115165 | Haug H. Brain sizes, surfaces... |
| Total number of neural cells in brain | Human Homo sapiens | at 20 weeks of intrauterine life ∼13×10^9: in adult 19–23×10^9 | neurons | 117218 | Malik S et al., Neurogenesis... |
| Number of neurons and glial cells in neocortex | Human Homo sapiens | 5e+10 | cells | 103185 | Pelvig DP, Pakkenberg H... |
| Number of neurons and glial cells in male neocortex | Human Homo sapiens | 6.52e+10 | cells | 103182 | Pelvig DP, Pakkenberg H... |
| Ratio between number of glia cells and number of neurons in male neocortex | Human Homo sapiens | 1.49 | unitless | 103183 | Pelvig DP, Pakkenberg H... |
| Ratio between number of glia cells and number of neurons in female neocortex | Human Homo sapiens | 1.32 | unitless | 103184 | Pelvig DP, Pakkenberg H... |
| Volume of the neocortex | Human Homo sapiens | 489 | cm^3 | 103188 | Pakkenberg B, Gundersen... |
| Average number of synaptic connections each neocortical neuron has | Human Homo sapiens | 7000 | synaptic connections/neocortical neuron | 112055 | Drachman D (2005). "Do... |
| Number of synapses in cerebral cortex | Human Homo sapiens | ~1.5×10^14 | synapses | 112056 | Drachman D (2005). "Do... |
| Diameter of neuron in caudate nucleus | Cat Felis silvestris catus | majority of neurons 10-15µm: much less abundant neurons 18-20µm: total range 7.5-32.5µm | µm | 112117 | Adinolfi AM, Pappas GD.... |
| Percent of prefrontal lobe volume out of neocortex volume | macaque | 11.5 | Percent | 103174 | Fuster JM. Frontal lobe... |
| Percent of prefrontal lobe volume out of neocortex volume | dog | 12.5 | Percent | 103176 | Fuster JM. Frontal lobe... |
| Neocortex ventricular volume | Human Homo sapiens | 16.9 | cm^3 | 103192 | Pakkenberg B, Gundersen... |
| Cerebral cortex proportion out of central nervous system (by volume) | Rat Rattus norvegicus | 31 | % | 103201 | Mapping the human brain: past... |
| Percent of prefrontal lobe volume out of neocortex volume | Human Homo sapiens | 29 | % | 103172 | Fuster JM. Frontal lobe... |