EVERYDAY SCIENCE

Detailed explanation-1: -Remarkably, at an average of 86 billion neurons and 85 billion nonneuronal cells (25), the human brain has just as many neurons as would be expected of a generic primate brain of its size and the same overall 1:1 nonneuronal/neuronal ratio as other primates (26).

Detailed explanation-2: -For half a century, neuroscientists thought the human brain contained 100 billion nerve cells. But when neuroscientist Suzana Herculano-Houzel devised a new way to count brain cells, she came up with a different number-86 billion.

Detailed explanation-3: -Approximately 86 billion neurons in the human brain.

Detailed explanation-4: -The average adult human brain contains approximately 100 billion neurons, and just as many-if not more-glia. Although neurons are the most famous brain cells, both neurons and glial cells are necessary for proper brain function.