definition of demyelination
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- By Sally Robertson, BSc. The term demyelination refers to loss of the myelin sheath that surrounds and protects axons in the central nervous system. Demyelination occurs as the result of diseases that damage the myelin sheath or the cells that form it. Diseases that are characterized by this loss of myelin are referred to as demyelinating diseases. The myelin sheath covers and insulates axons, aiding the conduction of electrical signals between nerves.
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- Medical Definition of Multiple sclerosis. Multiple sclerosis: A disease that is characterized by loss of myelin (demyelinization). Abbreviated MS. Myelin, the coating of nerve fibers, is composed of lipids (fats) and protein. It serves as insulation and permits efficient nerve fiber conduction.
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- News Home &nbsp Next Topic. New Samsung Z3X PRO paid update for Z3x box allows safe direct unlock, IMEI repair without rooting or EFS wipe, SN, Bluetooth, WiFi, Product code, etc. for majority of new Samsung mobile phones.This solution will not touch any calibration data, meaning that 3G/LTE network will remain unaffected on the following models.ews Home &nbsp Next Topic. New Samsung Z3X PRO paid update for Z3x box allows safe direct unlock, IMEI repair without rooting or EFS wipe, SN, Bluetooth, WiFi, Product code, etc. for majority of new Samsung mobile phones.
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- The definition of an aberration is something that is abnormal or unexpected such as a strange action or mental state. An example of a mental aberration is schizophrenia. 1  a departure from what is right, true, correct, etc.  a deviation from the normal or the typical.
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- In the demyelination process, areas of lipid degeneration in the myelin sheath are referred to as neuritic plaques. These may be variable in size. The residual degenerated myelin sheath is removed by macrophages that gather at the affected site along with lymphocytes.
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Definitions &Translations Wiktionary (0.00 / 0 votes) Rate this definition: dilapidation (Noun). The state of being dilapidated, reduced to decay, partially ruined. dilapidation (Noun). The act of dilapidating, damaging a building or structure through neglect or by intention.
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Medical Definition of Aberration Definition of Aberration. Aberration: (1) A deviation or irregularity. For example, a chromosome aberration is a deviation from the normal chromosome number or the normal chromosome structure. In this sense, aberration is also synonymous with deflection, departure, divergence, diversion, turning. (2) A mental aberration is a significant deviation from normal mental activity.
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Demyelinating disease Demyelinating diseases are traditionally classified in two kinds: demyelinating myelinoclastic diseases and demyelinating leukodystrophic diseases. In the first group a normal and healthy myelin is destroyed by a toxic, chemical or autoimmune substance. In the second group, myelin is abnormal and degenerates.
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Demyelinating disease Neuroleptics can also cause demyelination. Demyelinating diseases are traditionally classified in two kinds: demyelinating myelinoclastic diseases and demyelinating leukodystrophic diseases. In the first group a normal and healthy myelin is destroyed by a toxic, chemical or autoimmune substance.In the second group, myelin is abnormal and degenerates.euroleptics can also cause demyelination. Demyelinating diseases are traditionally classified in two kinds: demyelinating myelinoclastic diseases and demyelinating leukodystrophic diseases. In the first group a normal and healthy myelin is destroyed by a toxic, chemical or autoimmune substance.
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diffraction noun. Diffraction is defined as a process by which light waves break up into dark and light bands or into the colors of the spectrum. Light passing through a narrow opening in the blinds, causing bright and dark shadows and patterns to fall across the floor is an example of defraction.iffraction-Computer Definition. The process by which the propagation of radiant waveforms or light waves is modified as those waves encounter an obstacle or discontinuity, or exit one medium and enter another. Some of the waves deviate from their paths, i.e., bend, by diffraction.
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Magnetic Declination Magnetic Declination Magnetic declination, sometimes called magnetic variation, is the angle between magnetic north and true north. Declination is positive east of true north and negative when west. Magnetic declination changes over time and with location. As the compass points with local magnetic fields, declination value is needed to obtain true north.. more
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- Symptoms of demyelinating disease. The symptoms of demyelination depend on the type of demyelinating disease a person has and whether the central nervous system or peripheral nervous system is affected. Examples of some of the symptoms that may manifest in demyelinating diseases include:1  Impaired vision, ocular paralysis.ymptoms of demyelinating disease. The symptoms of demyelination depend on the type of demyelinating disease a person has and whether the central nervous system or peripheral nervous system is affected. Examples of some of the symptoms that may manifest in demyelinating diseases include:
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- 2. A nontraumatic, usually sporadic, generalized disorder of nerve roots and peripheral nerves, which may affect motor fibers or sensory fibers, but usually both, although often not to the same degree; classified as axon degenerating (axonal) or demyelinating.
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Declination In astronomy, declination (abbreviated dec; symbol δ) is one of the two angles that locate a point on the celestial sphere in the equatorial coordinate system, the other being hour angle.eglecting atmospheric refraction, declination is always 0° at east and west points of the horizon. At the north point, it is 90° − | φ |, and at the south point, −90° + | φ |.
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Dyscalculia Dyscalculia is usually perceived of as a specific learning difficulty for mathematics, or, more appropriately, arithmetic.evelopmental Dyscalculia (DD) is a specific learning disorder that is characterised by impairments in learning basic arithmetic facts, processing numerical magnitude and performing accurate and fluent calculations.
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- Demyelination is the breakdown of the protective covering of the nerve fibers in the spinal cord and brain. This protective covering, called a myelin sheath, helps promote proper nerve function. Demyelination is a condition known as demyelinating disease.There are several causes of demyelination. Myelin, found in the insulating white matter around the nerves, is an important part of the nerves.During transmission of information, myelin has the responsibility of receiving and interpreting the messages sent from the brain.here are several causes of demyelination. Myelin, found in the insulating white matter around the nerves, is an important part of the nerves. During transmission of information, myelin has the responsibility of receiving and interpreting the messages sent from the brain.
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degeneration degeneration. deterioration; change from a higher to a lower form, especially change of tissue to a lower or less functionally active form. When there is chemical change of the tissue itself it is true degeneration; when the change consists in the deposit of abnormal matter in the tissues, it is infiltration.apetoretinal degeneration degeneration of the pigmented layer of the retina. transneuronal degeneration atrophy of certain neurons after interruption of afferent axons or death of other neurons to which they send their efferent output.
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demyelination loss or destruction of myelin sheath surrounding nerves, with associated loss of effective nerve impulse conduction; characteristic of demyelinating diseases demyelination, n breakdown of the myelin sheaths covering nerves and nerve fibers.
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divination The definition of a divination is the practice of telling of the future or a prophecy. An example of a divination is what a psychic does. divination. divination. The art or act of foretelling future events or revealing occult knowledge by means of augury or an alleged supernatural agency.
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A to Z List of Neurological Disorders A demyelinating disease occurs when the myelin sheath, a protective covering that surrounds brain and spinal cord nerves is damaged. In the case of Devic's disease, the patient develops myelitis (inflammation of the spinal cord) and optic neuritis (inflammation of the optic nerve).
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- Demyelination is the breakdown of the protective covering of the nerve fibers in the spinal cord and brain. This protective covering, called a myelin sheath, helps promote proper nerve function. Demyelination is a condition known as demyelinating disease.There are several causes of demyelination.Myelin, found in the insulating white matter around the nerves, is an important part of the nerves. During transmission of information, myelin has the responsibility of receiving and interpreting the messages sent from the brain.here are several causes of demyelination. Myelin, found in the insulating white matter around the nerves, is an important part of the nerves. During transmission of information, myelin has the responsibility of receiving and interpreting the messages sent from the brain.
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What Are Dissociative Disorders? Definition, Causes, Facts Dissociation is a lack of connection between thoughts, memories, surroundings, actions and/or identity. Normal forms of dissociation are minor and not problematic whereas when dissociative disorders are defined, they have severe symptoms that cause problems in a person's life.
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dissociative disorders The dissociative disorders are a group of mental disorders that affect consciousness defined as causing significant interference with the patient's general functioning, including social relationships and employment. group of mental disorders characterized by a sudden, temporary change in consciousness, identity, memory, or motor behavior so that some part or more of these functions is lost. The defense mechanism of dissociation underlies these disorders and any organic basis for the changes must be ruled out.
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Demyelination: What Is It and Why Does It Happen? 1 Myelin is an insulating material that, when it’s worn away or damaged, decreases nerve function. Damage to myelin is called demyelination. 2  There are different types of demyelination. These include inflammatory demyelination and viral demyelination.  MS is the most common demyelinating disease.
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- One of the most well known demyelinating diseases is multiple sclerosis (MS), an autoimmune disorder where demyelinating lesions of the central nervous system occur across the brain causing symptoms such as pain, cognitive and motor skill dysfunction and visual disturbances.
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T Cells It is now generally accepted that the demyelination seen in MS is caused by an abnormal immune process — that is, by activation of T cells (and perhaps B cells) against some component of central nervous system myelin (the fatty sheath that surrounds and insulates nerve fibers).