The adult human brain weighs on average about 1.3–1.5 kg (2.9–3.3 lb), or about 2% of total body weight,with a volume of around 1130 cm3 in women and 1260 cm3 in men, although there is substantial individual variation. Neurological differences between the sexes have not been shown to correlate in any simple way with IQ or other measures of cognitive performance.

The human brain is composed of neurons, glial cells, and blood vessels.

The cerebrum (cerebral hemispheres) forms the largest part of the human brain and is situated above other brain structures. They are covered with a cortical layer (the cerebral cortex) which has a convoluted topography.

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