![]() In 1873, Italian physician Camillo Golgi found a way to stain brain slices, to show the tissue in far more detail than ever before. Even if you manage to get a brain sample under a microscope, you basically just see a tangled web of cells. In fact, the oldest known scientific document is a 4,000-year-old anatomical report on traumatic brain injuries.īut the brain is an extremely difficult organ to study. Scientists have been studying the brain for millennia. And thanks to other neurons, we’re able to make sense of those perceptions and react accordingly. ![]() Whenever we see, hear, or otherwise perceive the world, thousands of sensory neurons send signals to our spinal cord and brain. Even more are spread throughout the body, communicating by electrical and chemical signals through incredibly thin cables. Our brains have about 86 billion neurons. ![]() Neurons are the tiny processing units within the human brain and nervous system.
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