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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).
Relationship Between Structure and Function of a Motor Neurons. Nervous tissue is specialized to react to stimuli and to conduct impulses to various parts of the body, namely muscles. A nerve is made up of neurofibrils (filaments) that provide structural support, these fibres are bound together by connective tissue.