<Li> The axon terminal contains synapses, specialized structures where neurotransmitter chemicals are released to communicate with target neurons . </Li> <P> The accepted view of the neuron attributes dedicated functions to its various anatomical components; however, dendrites and axons often act in ways contrary to their so - called main function . </P> <P> Axons and dendrites in the central nervous system are typically only about one micrometer thick, while some in the peripheral nervous system are much thicker . The soma is usually about 10--25 micrometers in diameter and often is not much larger than the cell nucleus it contains . The longest axon of a human motor neuron can be over a meter long, reaching from the base of the spine to the toes . </P> <P> Sensory neurons can have axons that run from the toes to the posterior column of the spinal cord, over 1.5 meters in adults . Giraffes have single axons several meters in length running along the entire length of their necks . Much of what is known about axonal function comes from studying the squid giant axon, an ideal experimental preparation because of its relatively immense size (0.5--1 millimeters thick, several centimeters long). </P>

How long is the longest neuron in the human body and where is it located
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