How many Neurons and Synapses are there in a Brain?

Neurons and Synapses

Neurons communicate with one another via synapses, where the axon terminal of one cell impinges upon another neuron’s dendrite. The human brain has a huge number of synapses. Each of the one hundred billion neurons has on average 7,000 synaptic connections to other neurons. It has been estimated that the brain of a three-year-old child has about 1 quadrillion synapses. This number declines with age, stabilizing by adulthood. Estimates vary for an adult, ranging from 100 to 500 trillion synapses.

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