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.
In the spinalcord, they connect sensory neurons to motor neurons. In the brain, they formcomplex assemblages of interconnected nerve cells that process information fromsensory organs and control higher mental functions, such as planning andthinking.A neuron is not the same thing as a nerve.hrough itsdendrites, each neuron may receive messages from thousands of other neurons(Kennedy, 2000).The nervous system has three types of neurons: sensory neurons, motor neu-rons, and interneurons.