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Myelin sheath of a healthy neuron in the central nervous system. Multiple sclerosis is an inflammatory demyelinating disease of the CNS in which activated immune cells invade the central nervous system and cause inflammation, neurodegeneration, and tissue damage. The underlying cause is currently unknown.
Inflammatory demyelinating diseases (IDDs), sometimes called Idiopathic (IIDDs) due to the unknown etiology of some of them, are a heterogenous group of demyelinating diseases - conditions that cause damage to myelin, the protective sheath of nerve fibers - that occur against the background of an acute or chronic inflammatory process.
A repair process, called remyelination, takes place in early phases of the disease, but the oligodendrocytes are unable to completely rebuild the cell's myelin sheath. Repeated attacks lead to successively less effective remyelinations, until a scar-like plaque is built up around the damaged axons.
In the second group, the myelin is inherently abnormal and undergoes degeneration. [6] The Poser criteria named this second group dysmyelinating diseases. [7] In the most well-known demyelinating disease, multiple sclerosis, evidence suggests that the body's immune system plays a significant role.
Multiple sclerosis (MS) is an autoimmune disease resulting in damage to the insulating covers of nerve cells in the brain and spinal cord. [3] As a demyelinating disease , MS disrupts the nervous system's ability to transmit signals , resulting in a range of signs and symptoms , including physical, mental , and sometimes psychiatric problems.
Multiple sclerosis (MS) is a chronic debilitating demyelinating disease of the central nervous system, caused by an autoimmune attack resulting in the progressive loss of myelin sheath on neuronal axons. [37]
Doctors debate whether MS is an autoimmune disorder, arguing that it could possibly be a neurodegenerative disorder instead. Scientists have also made headway into several cause-related theories.
Multiple sclerosis diagnosis can only be made when there is proof of lesions disseminated in time and in space. Therefore, when damage in the CNS is big enough to be seen. It would be desirable to make it faster. The ideal diagnosis schema would be able to determine for any given subject, if he will develop MS, at any point in his life, and when.
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