Heavily myelinated bundles of axons in the brain are called:

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Heavily myelinated bundles of axons in the brain are called white matter. White matter refers to the areas of the brain that are primarily made up of myelinated axons, which are responsible for transmitting electrical signals between different areas of the brain. The term "white matter" comes from the appearance of these areas when viewed under a microscope, where they appear white due to the high lipid content of the myelin sheath.

Heavily Myelinated Bundles of Axons in the Brain Are Called