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How many neutrons are in a brain?

Updated: 6/1/2024
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11y ago

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Over 400,094,800 cells is the answer listed here, which appears to be completely incorrect.

A quick Google search found a consensus around the 100,000,000,000 mark. Here are the sources.

Glencoe Health 2nd Edition. Mission Hills: Glencoe Inc., 1989: 252."Weighing around three pounds (1.35kg), the brain contains nearly 100 billion cells."100 billionWorld Book 2001. Chicago: World Book Inc., 2001: 551."The human brain has from 10 billion to 100 billion neurons."10-100 billionMagill's Medical Guide Revised Edition. Salem Press, 1998: 221."It has been estimated that the adult brain has around one hundred billion neurons and an even larger number of glial cells."100 billionThe Science Times Book of the brain. New York: The Lyons Press, 1987: 150."The human brain holds about 100 billion nerve cells."100 billionThe Scientific American Book of the Brain. New York: Scientific American, 1999: 3."An adult human brain has more than 100 billion neurons"> 100 billion

Please note that "the answer listed here" - over 400,094,800 - refers to the number of cells in the human brain. The 100 billion figure, mentioned repeatedly in the sources quoted above, refers to neurons or nerve cells, which are only one kind of brain cell. As indicated by the 3rd cited source, neurons are actually thought to comprise less - far less, according to most authorities - than 50% of the total. (Glial cells are the most numerous.) So 400,094,800, while an improbably specific number, could well be close to the mark.
the brain has about 1 billion cells

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11y ago
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11y ago

The average human brain has a mass of 1.5 kg (source: Wikipedia; see the related links section below). Most of this mass is due to nucleons (protons and neutrons) and, to a reasonable first approximation, there are equal numbers of each.

Thus, since the mass of a neutron is very nearly the same as the mass of a proton, the number of neutrons is one-half the mass of the brain divided by the mass of a neutron, which yields:

Number of neutrons = (1/2)(1.5 kg) / (1.67 x 10-27 kg) = 4 x 1026, to one significant figure.

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15y ago

about 100 billion The other kind of brain cell is called a glial cell or neuroglia.

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12y ago

There are approximately 100 billion neurons in the human brain.

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15y ago

100 billion almost all of them are interneurons

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2w ago

The number of neutrons in a brain can vary depending on the individual and their age, but on average, there are approximately 8.31 x 10^21 neutrons in the human brain.

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11y ago

An adult human brain has more than 100 billion neurons.

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12y ago

3'5 billions

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