MYELIN SHEATH Meaning and
Definition
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The myelin sheath refers to a protective layer made up of fatty materials that surrounds and insulates nerve fibers in the central nervous system (CNS) and peripheral nervous system (PNS). This sheath acts as an insulator, enhancing the speed and efficiency at which impulses travel along the nerve fibers. Composed of a unique type of glial cells called oligodendrocytes in the CNS and Schwann cells in the PNS, the myelin sheath is crucial in the proper functioning of the nervous system.
Functionally, the myelin sheath facilitates the transmission of nerve impulses by preventing electrical interference between adjacent nerve fibers, thus allowing for smooth and uninterrupted signal propagation. It accomplishes this through a process known as saltatory conduction, where nerve impulses jump from one node of Ranvier to another along the myelinated fiber, significantly increasing the speed of conduction.
In addition to insulation, the myelin sheath also provides support and protection to the nerve fibers, preventing damage and degradation. Disorders affecting the myelin sheath, such as multiple sclerosis (MS), can impair the normal function of the nervous system and lead to various symptoms, including movement difficulties, sensory disturbances, and cognitive impairments.
Understanding the structure and function of the myelin sheath is crucial in comprehending the mechanisms underlying the normal physiology of the nervous system and the pathophysiology of related disorders.
Common Misspellings for MYELIN SHEATH
- nyelin sheath
- kyelin sheath
- jyelin sheath
- mtelin sheath
- mgelin sheath
- mhelin sheath
- muelin sheath
- m7elin sheath
- m6elin sheath
- mywlin sheath
- myslin sheath
- mydlin sheath
- myrlin sheath
- my4lin sheath
- my3lin sheath
- myekin sheath
- myepin sheath
- myeoin sheath
- myelun sheath
Etymology of MYELIN SHEATH
The word "myelin" originated from the Greek word "myelos", which means "marrow". In anatomy, the term "myelin" denotes the fatty substance found in the nervous tissue. The term "sheath" refers to a covering or protective layer. Therefore, the term "myelin sheath" signifies the protective covering made of myelin that surrounds and insulates the axons of neurons in the nervous system.
Similar spelling words for MYELIN SHEATH
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