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The average human brain weighs about 1,400 grams (3 lb). The brain looks a little like a large pinkish-gray walnut. The brain can be divided down the middle lengthwise into two halves called the cerebral hemispheres. Each cerebral hemisphere is divided into four lobes by sulci and gyri. The sulci (or fissures) are the grooves and the gyri are the "bumps" that can be seen on the surface of the brain. The folding created by the sulci and gyri increases the amount of cerebral cortex that can fit in the skull. The total surface area of the cerebral cortex is about 324 square inches or about the size of a full page of newspaper. Each person has a unique pattern of gyri and sulci.
Find out more about the frontal lobe with the story of an unlucky worker in 1848 who survived an iron rod that went through his head!! Read about Mr. Gage and the frontal lobe in a GREAT multimedia slide show. If you are interested in a book about Phineas Gage, try Phineas Gage: A Gruesome but True Story About Brain Science by John Fleischman (Boston: Houghton Mifflin Co., 2002).
|These brain images are being used with permission of the Slice of Life.|
Approximately Locations: Lobes of the Brain
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Take a short review quiz about the lobes of the brain.
Review the lobes of the brain with this online coloring page.
Review the lobes of the brain with this online puzzle.
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