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The cell body of a neuron is supported by a complex meshwork of structural proteins called neurofilaments, which are assembled into larger neurofibrils. Some neurons also contain pigment granules, such as neuromelanin (a brownish-black pigment, byproduct of synthesis of catecholamines) and lipofuscin (yellowish-brown pigment that accumulates with age).
Neurons have long tethers that are easy to study called 'axons' that extend from the cell body from the brain into the spine and the spine out to the limbs and body. Similarly, neurons in the senses were linked to the neurons in the brain. This is where the notion of neurons as the base of our thoughts took root. In the mid-19th century, glia were just being discovered, and researchers figured the glial cells simply held the neurons together (glia is greek for glue).