What term describes white matter bundles that carry information between different parts of the brain and spinal cord?

• A. Nuclei
• B. Fiber Tracts
• C. Nerve Roots
• D. Ganglia

Answer: (B)

White matter bundles that carry information between different parts of the brain and spinal cord are called fiber tracts. These tracts are made of myelinated axons that form pathways, linking various gray matter regions and allowing signals to travel quickly across the central nervous system. This contrasts with gray matter, which is rich in neuron cell bodies and synapses.

Nuclei are clusters of neuron cell bodies within the CNS (gray matter), nerve roots are bundles of axons that exit the spinal cord and belong to the peripheral nervous system, and ganglia are clusters of neuron cell bodies in the peripheral nervous system. Fiber tracts specifically describe the white matter communication pathways throughout the brain and spinal cord.