A neuron is composed of which structures?

• A. A cell body and mitochondria
• B. An axon, dendrites and neurofibrils
• C. A myelin sheath and ventricles
• D. A nucleus and ribosomes

Answer: (B)

Neurons are defined by their specialized extensions and internal scaffolding that support signal transmission. Dendrites receive incoming signals, the axon sends impulses onward, and neurofibrils provide the internal cytoskeletal framework that maintains shape and helps transport materials along the cell. This combination—axons, dendrites, and neurofibrils—best captures the structural elements that make a neuron functional. While a neuron does contain a cell body with a nucleus and mitochondria, and other tissue features like myelin or brain cavities exist, the defining structural components described here are the paired processes plus the cytoskeletal network.