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Monday, 29 August 2016

Nervous system

HUMAN

Wedding rings are worn on the fourth finger of the left hand because the Romans believed that a nerve led directly from there to the heart.

The first human nerve transplant was performed by Dr James Campbell at the New York University Medical Center on April 18, 1963.

There are 45 miles of nerves in the skin of a human being.

Nervous system.By Own work, CC BY 3.0, Wikipedia Commons

Nerve impulses to and from the brain can travel as fast as 170 miles an hour.

Scientists have figured out that the speed of nerve impulses within the brain is 275 miles per hour. If an idea is complex enough to take 100 nerve messages from one side of the brain to the other, the thought could be completed in less than a tenth of a second.

Your spinal cord controls your entire central nervous system, and it's only between nearly .4 to almost .6 inches in diameter.

People don't sneeze when they are asleep because the nerves involved in the sneeze reflex are also resting.


If you have nerve damage in your hand it won't wrinkle when submerged in water.

ANIMAL

Deprived of sight and hearing, seals can still accurately pinpoint the locations of fish because they have 1,500 nerve endings in their whiskers.

A lobster's nervous system is located in its abdomen.

Uniquely, octopuses have more than half their nerves in their arms and even partially think with them.

Turtle and tortoise shells have nerve endings, so they can feel every scratch and rub.

The central nervous systems of the smallest spiders fill up almost 80 percent of their total body cavity, including about 25 percent of their legs.

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