degeneration /de·gen·er·a·tion/ (de-jen″er-a´shun) deterioration; change from a higher to a lower form, especially change of tissue to a lower or less functionally active form.degen´erative
degeneration [de-gen″ĕ-ra´shun]
ascending degeneration wallerian degeneration affecting centripetal nerve fibers and progressing toward the brain or spinal cord.
calcareous degeneration degeneration of tissue with deposit of calcareous material.
caseous degeneration caseation (2).
cerebromacular degeneration (CMD), cerebroretinal degeneration
1. degeneration of brain cells and of the macula retinae.
2. any lipidosis with cerebral lesions and degeneration of the macula retinae.
3. any form of neuronal ceroid-lipofuscinosis.
congenital macular degeneration hereditary macular degeneration with a cystlike lesion that in the early stages resembles egg yolk.
Crooke's hyaline degeneration Crooke's hyalinization.
descending degeneration wallerian degeneration extending peripherally along nerve fibers.
disciform macular degeneration a form of macular degeneration seen in persons over age 40, in which sclerosis involving the macula and retina is produced by hemorrhages between Bruch's membrane and the pigment epithelium.
fibrinous degeneration necrosis with deposit of fibrin within the cells of the tissue.
gray degeneration degeneration of the white substance of the spinal cord, in which it loses myelin and assumes a gray color.
hepatolenticular degeneration Wilson's disease.
hyaline degeneration a regressive change in cells in which the cytoplasm takes on a homogeneous, glassy appearance; also used loosely to describe the histologic appearance of tissues.
lattice degeneration of retina an often bilateral, usually benign asymptomatic condition, characterized by patches of fine gray or white intersecting lines in the peripheral retina, usually with numerous round punched-out areas of retinal thinning or retinal holes.
macular degeneration degenerative changes in the macula retinae.
mucoid degeneration that with deposit of myelin and lecithin in the cells.
myxomatous degeneration degeneration in which mucus accumulates in connective tissues.
spongy degeneration of central nervous system , spongy degeneration of white matter a rare hereditary form of leukodystrophy of early onset in which widespread demyelination and vacuolation of cerebral white matter gives it a spongy appearance; there is mental retardation, megalocephaly, atony of neck muscles, limb spasticity, and blindness, with death in infancy.
striatonigral degeneration a form of multiple system atrophy with nerve cell degeneration mainly in the region of the substantia nigra and the neostriatum; symptoms are similar to those of parkinsonism.
subacute combined degeneration of spinal cord degeneration of posterior and lateral columns of the spinal cord, with various motor and sensory disturbances; it is due to vitamin B12 deficiency and usually associated with pernicious anemia.
tapetoretinal 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.
Zenker's degeneration hyaline degeneration and necrosis of striated muscle.
Zen·ker's degeneration (z ng k rz, tsng)n. A form of severe hyaline degeneration or necrosis in skeletal muscle, occurring in severe infections. Also called waxy degeneration, Zenker's necrosis. |
degeneration [de-gen″ĕ-ra´shun]
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. adj., adj degen´erative.
caseous degeneration caseation (def. 2).
cerebromacular degeneration (cerebroretinal degeneration)
1. degeneration of brain cells and of the macula retinae, as occurs in tay-sachs disease.
2. any lipidosis with cerebral lesions and degeneration of the retinal macula.
3. any form of neuronal ceroid-lipofuscinosis.
colloid degeneration degeneration with conversion of the tissues into a gelatinous or gumlike material.
cystic degeneration degeneration with formation of cysts.
fatty degeneration deposit of fat globules in a tissue.
hepatolenticular degeneration Wilson's disease.
hyaline degeneration a regressive change in cells in which the cytoplasm takes on a homogeneous, glassy appearance; also used loosely to describe the histologic appearance of tissues.
hydropic degeneration a form in which the epithelial cells absorb much water.
lattice degeneration of retina a frequently bilateral, usually benign asymptomatic condition, characterized by patches of fine gray or white lines that intersect at irregular intervals in the peripheral retina, usually associated with numerous, round, punched-out areas of retinal thinning or retinal holes.
macular degeneration see macular degeneration.
macular degeneration, congenital see stargardt's disease.
macular degeneration, Stargardt's stargardt's disease.
mucoid degeneration degeneration with deposit of myelin and lecithin in the cells.
mucous degeneration degeneration with accumulation of mucus in epithelial tissues.
myofibrillar degeneration damage to selective cardiac cells when surrounding interstitial cells, nerves, and capillaries remain viable.
myxomatous degeneration mucous degeneration.
spongy degeneration of central nervous system (spongy degeneration of white matter) Canavan disease.
subacute combined degeneration of spinal cord degeneration of both the posterior and lateral columns of the spinal cord, producing various motor and sensory disturbances; it is due to vitamin B12 deficiency and is usually associated with pernicious anemia. Called also Lichtheim's or Putnam-Dana syndrome.
wallerian degeneration fatty degeneration of a nerve fiber that has been severed from its nutritive source.
Zenker's degeneration Zenker's necrosis.
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