PHYSIOLOGY
CENTRAL NERVOUS SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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A myelinated nerve fiber is characterized as being ____, whereas an unmyelinated nerve fiber is characterized as being ____
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Unique to the spinal cord; unique to the brain
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Unique to the brain; unique to the spinal cord
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White, and composes the white matter of the brain and spinal cord; gray, and composes the gray matter of the brain and spinal cord
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Gray and composes the white matter of the brain and spinal cord; White, composes the gray matter of the brain and spinal cord.
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Explanation:
Detailed explanation-1: -White matter is one of the two components of the central nervous system and consists mostly of glial cells and myelinated axons. The white matter is white because of the fatty substance ( myelin ) that surrounds the nerve fibers. Myelin acts as an electrical insulation.
Detailed explanation-2: -White matter is found in the deeper tissues of the brain (subcortical). It contains nerve fibers (axons), which are extensions of nerve cells (neurons). Many of these nerve fibers are surrounded by a type of sheath or covering called myelin. Myelin gives the white matter its color.
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