Which region is mainly composed of myelinated axons and lies beneath the cortex?

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Multiple Choice

Which region is mainly composed of myelinated axons and lies beneath the cortex?

White matter is mainly composed of myelinated axons, and it lies beneath the cerebral cortex. The myelin sheath, produced by oligodendrocytes in the brain, gives this region its lighter appearance and enables fast signal transmission between different brain areas. The cortex itself is gray matter, rich in neuronal cell bodies and unmyelinated fibers. The Blood-Brain Barrier is a protective vascular feature, not a brain region. The cerebrum includes both gray and white matter, but the specific layer under the cortex that this question describes is white matter.

White matter is mainly composed of myelinated axons, and it lies beneath the cerebral cortex. The myelin sheath, produced by oligodendrocytes in the brain, gives this region its lighter appearance and enables fast signal transmission between different brain areas. The cortex itself is gray matter, rich in neuronal cell bodies and unmyelinated fibers. The Blood-Brain Barrier is a protective vascular feature, not a brain region. The cerebrum includes both gray and white matter, but the specific layer under the cortex that this question describes is white matter.

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