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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 nucleus of a neuron is located in the axon hillock. Synaptic cells nourish neurons, insulate the axons of neurons, and/or regulate the extracellular fluid surrounding the neurons. The vast majority of neurons in the brain are sensory neurons. Sensory neurons transmit signals to muscle cells. None of the listed responses is correct.