âWe are the laggard partner in this co-evolution.â âShe said that Newry's success is not through external help but through the energy of the people that âcaptured the imagination of the whole of Ireland and even cajoled the laggard politicians.ââ
One type of neuron called the Purkinje cell, found in the cerebellum, may have as many as one hundred thousand synapses.How big is a synapse? [ii]Synapses are very small. This narrow gap of extracellular space is approximately 20-40 nanometers (nm) wide. For an idea of scale, one inch is about 25.4 million nm long. The thickness of a single sheet of paper is about 100,000 nm.[iii]How many synapses are in the human brain?[iv][v]Current studies estimate that the average adult male human brain contains approximately 86 billion neurons.
The human brain is composed of neurons, glial cells, and blood vessels. The number of neurons is estimated at roughly 100 billion. During early pregnancy, neurons have shown to multiply at a rate of 250,000 neurons per minute. The adult human brain is estimated to contain 86Â±8 billion neurons, with a roughly equal number (85Â±10 billion) of non-neuronal cells.