![]() Cerebrum The cerebrum (front of brain) comprises gray matter (the cerebral cortex) and white matter at its center. Main Parts of the Brain and Their Functions At a high level, the brain can be divided into the cerebrum, brainstem and cerebellum. The real human brain contains about 100 billion neurons, so scientists are getting close-in raw numbers, at least. To do this, the central nervous system relies on billions of neurons (nerve cells). Researchers are testing hypotheses about how the brain works. Someday, similar maps of human brains may yield clues to mental illness, memory, and personality traits.ġ billion Number of neurons, linked by 10 trillion synapses, in a brain simulation developed by IBM and Lawrence Berkeley National Lab, running on the Dawn supercomputer. The researchers will image each slice under an electron microscope and then build a 3-D picture of all of the brain’s connections. ![]() Most of the 2 billion or so nerve endings in the outermost layer of our skin sense pain those dedicated to temperature allow us to detect differences as small as 0.01 degree Fahrenheit.Ģ,000 Number of slices created from the cerebral cortex of a mouse by Harvard University scientists. ![]() 50 Depth, in nanometers, of the smallest grooves detectable by a human fingertip (that is about 2 millionths of an inch).
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