What is the Corpus Callosum primarily composed of?

The Corpus Callosum is primarily composed of commissural fibers, which are bundles of axons that connect and facilitate communication between the two hemispheres of the brain. These fibers play a crucial role in integrating motor, sensory, and cognitive functions across the left and right sides of the brain, allowing for coordinated activity.

Commissural fibers are specifically designed to bridge the two hemispheres, enabling them to communicate efficiently. This structural composition is vital for many functions, such as language processing, motor control, and the integration of sensory information.

In contrast, gray matter consists of neuronal cell bodies and is primarily found on the brain's surface, accounting for the cerebral cortex's appearance. Cerebrospinal fluid serves as a protective cushion and nutrient medium for the brain and spinal cord but does not make up the structure of the Corpus Callosum. Association fibers, although they also consist of axons, are responsible for connecting different parts of the same hemisphere, rather than linking the two hemispheres, which is the role of the Corpus Callosum.