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The average human brain weighs about 1,400 grams (3 lb). When the brain is removed from the skull, it looks a bit like a large pinkish-gray walnut. The brain can be divided down the middle lengthwise into two halves called the cerebral hemispheres. Each hemisphere of the cerebral cortex is divided into four lobes by various 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 of the cerebral cortex produced by these bumps and grooves increases the amount of cerebral cortex that can fit in the skull. (In fact, the total surface area of the cerebral cortex is about 324 square inches - about the size of a full page of newspaper!). Although most people have the same patterns of gyri and sulci on the cerebral cortex, no two brains are exactly alike.

FRONTAL LOBE
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).
PARIETAL LOBE
TEMPORAL LOBE
OCCIPITAL LOBE

Images used with permission of the Slice of
Life.
Hear IT!
Gyri | Gyrus | Sulcus | Sulci | Frontal | Occipital | Parietal | Temporal
Did you know?![]() |
September 13, 1998 marked the 150th Anniversary of the injury to Mr. Phineas Gage. Find out more about poor Mr. Gage.
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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.
Review the
lobes of the brain with a SHOCKWAVE GAME! For this Build a Brain Game, you must have the
Shockwave plug-in for your browser. Get the
Shockwave plug-in.
Copyright © 1996-2008, Eric H. Chudler All Rights Reserved.