Respuesta :
White matter in the brain and spinal cord consists mostly of myelinated nerve fibers along with some unmyelinated fibers and neuroglial cells.
What is white matter?
It refers to the areas of the central nervous system (CNS) that are mainly made up of myelinated axons, also called tracts. It affects learning and brain functions, modulating the distribution of action potentials, acting as a relay, and coordinating communication between different brain regions.
Difference between myelinated and unmyelinated nerve fibers?
The main difference between myelinated and unmyelinated nerve fibers is that myelinated nerve fibers contain myelin insulation whereas unmyelinated nerve fibers do not contain myeline insulation.
Myelin sheath prevents the loss of the impulse during conduction and mostly includes peripheral nerves.
The myelin covering the axons of these fibers gives the white brain matter its white appearance and these axons protected by myelin sheath are not easily damaged by the external environment and the rate of nerve impulse is also high in comparison to unmyelinated axons.
Hence white matter is composed of myelinated and unmyelinated axons and is superficial to the grey matter.
Learn more about the white matter from the link given below:
https://brainly.com/question/28525147?utm_source=android&utm_medium=share&utm_campaign=question
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