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 contains approximately 400,000 to 600,000 dopaminergic neurons and thus make up less than 1% of the total number of brain neurons.There are nine dopamine-containing neuronal cell groups in the mammalian brain, each with distinct cellular properties.reater than 70% of all dopaminergic neurons are located in the substantia nigra (see Nigral dopaminergic Cell). Axons of dopaminergic neurons project to the brain by using one of three pathways: the mesostriatal, mesolimbic and mesocortical.