Fransson human brain mapping 2005
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An average male brain has approximately 4% more cells and 100 grams more brain tissue than an average female brain. The normal adult human brain typically weighs between 1 and 1.5 kg (3 lb) and has an average volume of 1,600 cm³ (98 in³). Click here for an animated sequence of slices. Sagittal slice from a MRI scan of a human brain. But the human brain is unique, in part, because it relies on some million billion synaptic connections, making it an extremely intricate and densely connected neural network. Human consciousness involves both the extended capacity of the modern neocortex in particular as well as profoundly developed prototypical structures of the brain stem. Basic systems that alert the nervous system to stimuli, sense events in the environment, and monitor and maintain the internal environment of the body ( homeostasis) are similar in some ways to those of the most basic vertebrates. Humans thus enjoy unique neural capacities despite the fact that much of the human neuroarchitecture resembles that of more primitive species. Singular among those of all animals, the human brain possesses the largest and most massive neocortex. Human encephalization is especially pronounced in the neocortex, the most complex portion of the cerebral cortex.7 Comparison of the brain and a computer.