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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 specialized cells of the nervous tissue are called NEURONS while the supportive cells are called NEUROGLIAL CELLS. The electrochemical wave conducted along the plasma membrane is referred to as NERVE IMPULSE. NEUROGLIAL CELLS (See Diagram 6.) These are the supportive cells of the nervous tissue. They provide physical support, nutrients, defense, insulation and re-absorption of neurotransmitters in the nervous system.