(For an intriguing possible environmental contributor to left-sided cancer see: ) Certain diseases are more common on either the left or right side of the body-breast cancer is more common on the left, and so is immune hypersensitivity. Individuals within a population (both people and animals) have a dominant eye and ear (usually the right)-why? Language function, for example, is controlled by the left cerebral cortex in 97% of right-handed individuals and 66% of left-handed individuals.
Behavior, brain function, and certain physiological processes show preferences for the left or right side of the body in both people and animals. Why are people and most animals bilaterally symmetrical on the outside, but anatomically asymmetrical inside? It is not only anatomy. There are no known medical disadvantages to having your organs on the “wrong” side, a condition called situs inversus, provided, of course, that your surgeon is advised of your situation prior to scrubbing up. Not only their heart, but all their internal organs are swapped left for right: liver, stomach, pancreas, gallbladder, spleen, colon, are all situated on the opposite side of the body from the familiar position depicted in anatomy books. That’s because some people (1 in 10,000) are born with their heart on the wrong side. Most people salute the flag by respectfully placing their right hand over their heart, but not everyone does this. Are lefties different? Mirror-image people provide clues
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