ANATOMY

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: -The number of neurons in the brain of animals varies greatly depending on the species. For example, the brain of a honeybee has around 960, 000 neurons, while the brain of a mouse has around 71, 000, 000 neurons. In comparison, the human brain has an estimated 86, 000, 000, 000 neurons.

Detailed explanation-4: -The human brain contains about 86 billion nerve cells (neurons)-called “gray matter, ” according to a 2012 study published in the Proceedings of the National Academy of Sciences.