Question

How many brain cells and synapses does human brain have?

Answer 1

The adult male human brain, at an average of 1.5 kg, has 86 billion neurons and 85 billion non-neuronal cells – numbers that deviate from the expected by 7 and 24% only.

Explanation:

The commonly “accepted” value of roughly 100 billion was re-examined carefully in the referenced paper, which also explains in detail how this compares with other animal brains, intelligence, and implications.

http://journal.frontiersin.org/article/10.3389/neuro.09.031.2009/full