Our BRAIN has a huge number of synapses.. Each of the 10¹¹ (one hundred billion) neurons has an average 7,,000 synaptic connections to other neurons.. It has been estimated that the brain of a three-year-old child has about 10¹⁵ synapses (1 quadrillion).. This number declines with age,, stabilizing by adulthood.. Estimates vary for an adult,, ranging from 10¹⁴ to 5 x 10¹⁴ synapses (100 to 500 trillion)..

Neurons communicate with one another via synapses.. Neurons such as Purkinje cells in the cerebellum can have over 1000 dendritic branches,, making connections with tens of thousands of other cells.. Other neurons,, such as the magnocellular neurons of the supraoptic nucleus,, have only one or two dendrites,, each of which receives thousands of synapses..

Synapses can be excitatory or inhibitory and either increase or decrease activity in the target neuron.. Some neurons also communicate via electrical synapses,, which are direct,, electrically conductive junctions between cells..

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