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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).
The nervous system is a complex organ made up of nerve cells (also called neurons) and glial cells, which surround and support neurons (see Figure 3.1). Neurons send signals that affect numerous functions including thought processes and movement.