Number of Neurons in the Brain
How many neurons are there in the brain?
Around 86 billion.
A 2009 study published in the Journal of Comparative Neurology places the number of neurons in the human brain at about 86 billion. Of these, around 16.3 billion are said to exist in the cerebral cortex and about 69 billion are in the cerebellum. Neuronal number varies from species to species.