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Amazing Facts

FUN FACTS - statistics about neurons in humans and other animals


*Here are some interesting facts and statistics about neurons
in humans and other animals:

Average number of neurons in the human brain= 100 billion

Average number of neurons in an octopus brain= 300 billion

Rate of neuron growth during development of a fetus (in the womb)= 250,000 neurons/minute

Diameter of a neuron= 4 to 100 microns

Longest axon of a neuron= around 15 feet (Giraffe primary afferent
axon from toe to neck)

Velocity of a signal transmitted through a neuron= 1.2 to 250 miles/hour

(remember that these are averages because there is
lots of variability in the nervous system!!)

Guess what? There are more nerve cells in the human brain than
there are stars in the Milky Way.

What if we lined up all the neurons in our body?
How long would that line stretch?

Well, let's think about this... Let's assume that one neuron is
about 10 microns long. Remember, this is just an example, because
neurons come in all different sizes. So, if we line up 100 billion
neurons which are 10 microns long . . .

100,000,000,000 neurons x 10 microns= 1000 km or about 600 miles!

This may help with the math:

1000 microns= 1milimeter (mm)

10 mm= 1centimeter (cm)

100 cm= 1 meter (m)

1000 m= 1 kilometer (km)

Related Tags: Human  Animals  Fun  
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