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Questions and Answers
The adult human brain weighs on average about 1.2–1.4 kg (2.6–3.1 lb) which is about 2% of the total body weight, with a volume of around 1260 cm3 in men and 1130 cm3 in women. There is substantial individual variation, with the standard reference range for men being 1,180–1,620 g (2.60–3.57 lb) and for women 1,030–1,400 g (2.27–3.09 lb). The cerebrum, consisting of the cerebral hemispheres, forms the largest part of the brain and overlies the other brain structures.The outer region of the hemispheres, the cerebral cortex, is grey matter, consisting of cortical layers of neurons. Each hemisphere is divided into four main lobes – the frontal lobe, parietal lobe, temporal lobe, and occipital lobe.Three other lobes are included by some sources which are a central lobe, a limbic lobe, and an insular lobe.The central lobe comprises the precentral gyrus and the postcentral gyrus and is included since it forms a distinct functional role.
The adult human brain weighs on average about 1.2–1.4 kg (2.6–3.1 lb) which is about 2% of the total body weight, with a volume of around 1260 cm3 in men and 1130 cm3 in women. There is substantial individual variation, with the standard reference range for men being 1,180–1,620 g (2.60–3.57 lb) and for women 1,030–1,400 g (2.27–3.09 lb). The cerebrum, consisting of the cerebral hemispheres, forms the largest part of the brain and overlies the other brain structures.The outer region of the hemispheres, the cerebral cortex, is grey matter, consisting of cortical layers of neurons. Each hemisphere is divided into four main lobes – the frontal lobe, parietal lobe, temporal lobe, and occipital lobe.Three other lobes are included by some sources which are a central lobe, a limbic lobe, and an insular lobe.The central lobe comprises the precentral gyrus and the postcentral gyrus and is included since it forms a distinct functional role.
Study Notes
Brain Structure and Size
- The average weight of an adult human brain is 1.2-1.4 kg (2.6-3.1 lb), accounting for about 2% of total body weight.
- The average brain volume is around 1260 cm3 in men and 1130 cm3 in women.
- There is significant individual variation, with a standard reference range of 1,180-1,620 g (2.60-3.57 lb) for men and 1,030-1,400 g (2.27-3.09 lb) for women.
Cerebrum and Cerebral Hemispheres
- The cerebrum is the largest part of the brain, consisting of the cerebral hemispheres that overlie other brain structures.
- The cerebral cortex is the outer region of the hemispheres, composed of grey matter and consisting of cortical layers of neurons.
- Each hemisphere is divided into four main lobes: frontal, parietal, temporal, and occipital.
Additional Lobes
- Some sources include three additional lobes: central, limbic, and insular.
- The central lobe comprises the precentral gyrus and the postcentral gyrus and is considered a distinct functional region.
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Description
Test your knowledge of the human brain's weight, size, and structure with this quiz! Explore facts about the adult brain's weight, volume, and individual variations. Challenge yourself with questions about the cerebrum and cerebral hemispheres.
