Neuron Labeling Quiz

1. On a neuron diagram, an arrow marks the cone-shaped area where the soma narrows toward the axon. What should the label say?

2. Two neurons are drawn at a chemical synapse. An arrow marks only the narrow extracellular gap between the sending terminal and receiving membrane. What is it?

3. An arrow points to the large organelle inside the soma that contains the neuron's DNA. Which label is correct?

4. A long axon gives off a side branch before reaching its terminal arbor. What is this branch called?

5. Under a microscope, dark-staining clumps in the soma represent rough endoplasmic reticulum and ribosomes used for protein synthesis. What are these clumps called?

6. A label points to the main part of a neuron that surrounds the nucleus and contains most of the cell's organelles. Which structure is it?

7. A label points just beyond the axon hillock to the region where action potentials commonly begin because voltage-gated sodium channels are densely concentrated. What is this region?

8. Which sequence best traces the usual path of information through a simplified multipolar neuron?

9. A tiny protrusion extends from a dendrite and forms the receiving side of a synapse. Which label is most specific?

10. In a peripheral nerve diagram, one glial cell wraps one segment of a single axon. Which cell should be labeled?

11. Which structure is usually the neuron's single long process that conducts electrical signals away from the soma?

12. At the far end of an axon, a diagram shows fine branches ending in small knobs that release neurotransmitter. Which label fits best?

13. A central nervous system diagram shows one glial cell extending several processes to myelinate portions of multiple axons. Which label is correct?

14. An arrow points to a small exposed gap between adjacent myelin segments along an axon. Which structure is indicated?

15. Which label belongs on the short, branching processes that typically receive signals from other neurons?

16. A diagram shows repeated insulating segments wrapped around an axon. What should the segments themselves be labeled?