The corpus callosum is primarily composed of which type of neural fibers?

The corpus callosum is primarily composed of which type of neural fibers?

• A. Myelinated axons
• B. Dendritic projections
• C. Unmyelinated axons
• D. Peripheral nerves

Answer: (A)

White matter tracts in the brain, such as the corpus callosum, are composed mainly of axons insulated with myelin. The corpus callosum is the major conduit linking the left and right cerebral hemispheres, and its fibers are predominantly myelinated to speed up signal transmission between corresponding cortical areas. Dendritic projections are neuronal inputs, not the long fiber tracts themselves. Unmyelinated axons exist in the CNS, but the corpus callosum’s bulk is myelinated, and peripheral nerves belong to the peripheral nervous system, not this brain structure. So the primary constituent is myelinated axons.

White matter tracts in the brain, such as the corpus callosum, are composed mainly of axons insulated with myelin. The corpus callosum is the major conduit linking the left and right cerebral hemispheres, and its fibers are predominantly myelinated to speed up signal transmission between corresponding cortical areas. Dendritic projections are neuronal inputs, not the long fiber tracts themselves. Unmyelinated axons exist in the CNS, but the corpus callosum’s bulk is myelinated, and peripheral nerves belong to the peripheral nervous system, not this brain structure. So the primary constituent is myelinated axons.