Which term describes networks formed by spinal nerves that branch out to supply different parts of the body?

• A. Plexuses
• B. Nuclei
• C. Tracts
• D. Ganglia

Answer: (B)

Networks formed by spinal nerves that branch out to supply different parts of the body are called plexuses. This term describes how the anterior rami of adjacent spinal nerves braid together and then split again to distribute nerves to various regions, especially the limbs and trunk. The network arrangement allows fibers to mix and re-route so multiple nerves can share supply to different areas, increasing flexibility and coverage. For example, the brachial plexus serves the upper limb, while the lumbosacral plexus serves the lower limb.

Nuclei are clusters of neuron cell bodies in the central nervous system, not networks of nerves. Tracts are bundles of axons within the CNS, carrying information up and down the spinal cord or brain. Ganglia are clusters of neuron cell bodies in the peripheral nervous system, but they are individual swellings along nerves rather than interwoven networks formed by multiple spinal nerves. Therefore, plexuses best fit the description.