Dilation of the pupil. The opposite of mydriasis is miosis.

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    The fatty substance that covers and protects nerves. Myelin is a layered tissue that surrounds the nerve fibers (axons). This sheath around the axons acts like a conduit in an electrical system, ensuring that messages sent by axons are not lost en route.

  • Myelination

    The formation of the myelin sheath around a nerve fiber. Also known as myelinization.

  • Myelinization

    The formation of the myelin sheath around a nerve fiber. Also known as myelination.

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    Inflammation of the spinal cord, such as from infection or immune inflammation.

  • Myelitis, transverse

    herpes simplex, herpes zoster, cytomegalovirus, Epstein-Barr virus, enteroviruses (poliomyelitis, Coxsackie virus, echovirus), human T-cell leukemia virus, human immunodeficiency virus (HIV), influenza, measles, and rabies, Mycoplasma pneumoniae, Lyme borreliosis, syphilis, and tuberculosis. There is no specific treatment for transverse myelitis. The prognosis for complete recovery from transverse myelitis is generally not good. Although recovery usually begins […]

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