hyaline degeneration

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

---

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.

---

hyaline degeneration

n.

Any of several degenerative processes that affect various cells and tissues, resulting in the formation of rounded masses or broad bands of homogeneous acidophilic substances that have a glassy appearance. Also called glassy degeneration, hyalinosis.

---

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. See also wallerian degeneration, Zenker's necrosis.

---

albuminoid degeneration

cloudy swelling, an early stage of degenerative change characterized by swollen, parboiled-appearing tissues which revert to normal when the cause is removed.

ballooning degeneration

swelling of the cytoplasm in epidermal cells without vacuolization, enlarged or condensed nuclei and acantholysis. A characteristic of viral infections of the skin. Called also koilocytosis.

caseous degeneration

caseation (2).

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.

feathery degeneration

said of hepatocytes; a hydropic change in hepatocytes which have suffered long-term exposure to cholestasis.

fibrinoid degeneration

deposition or replacement with eosinophilic fibrillar or granular substance resembling fibrin.

fibroid degeneration

degeneration into fibrous tissue.

hyaline degeneration

a regressive change in cells in which the cytoplasm takes on a homogeneous, glassy appearance; also used loosely to describe the histological appearance of tissues. Called also hyalinosis.

hydropic degeneration

see hydropic degeneration.

macular degeneration

degenerative changes in the macula retinae.

mucoid degeneration

degeneration with increased mucin which can be epithelial or mesenchymal in origin.

mucous degeneration

degeneration with accumulation of mucus in epithelial tissues. Called also myxomatous degeneration.

myxomatous degeneration

see mucous degeneration (above).

reticular degeneration

extreme intracellular edema of epidermal cells, resulting in rupture and multilocular intraepidermal vesicles with septae formed by the remaining cell walls. Seen in acute inflammatory dermatoses.

spongy degeneration

on microscopic examination has the physical appearance of a sponge. Usually applied to tissue of the central nervous system, caused by the loss of myelin.

---

hyaline

glassy; pellucid.

---

hyaline body

see apoptotic body.

hyaline cartilage

see hyaline cartilage.

hyaline cast

see urinary cast.

hyaline degeneration

see hyaline degeneration.

hyaline globules

composed of fibrin degradation products these contribute to the formation of microthrombi. Called also shock bodies.

hyaline membrane

composed of fibrin and cell debris, this membrane lines the alveoli when there has been severe damage to the alveolar epithelium. See also hyaline membrane (3).

hyaline membrane disease

a disorder of newborn animals, most commonly foals, characterized by the formation of a hyalin-like membrane lining the terminal respiratory passages. Neonates with this disease do not secrete adequate quantities of surfactant, which is secreted by type II alveolar epithelial cells, and decreases the surface tension of the fluids lining the alveoli and bronchioles. When the surface tension is kept low, air can pass through the fluids and into the alveoli. If the surface tension is not decreased by adequate supplies of surfactant, the alveoli cannot fill with air and there is partial or complete collapse of the lung (atelectasis). Thus the foal with hyaline membrane disease suffers from respiratory embarrassment with severe dyspnea. See also neonatal maladjustment syndrome.

---

Patient discussion about hyaline degeneration.

Q. HYALINE MEMBRANE DISEASE in pre-mature infants;what are the causes of it in pregnant women?

A. the cause of Hyaline Membrane disease is pre-mature birth. while the fetus develop, about in the 29th week a substance called surfactant is created in the lungs. this substance's function is to change the surface tension of the fluid in the lungs- therefore decreasing it's force. the surface tension tends to shrink the lungs and can cause the lungs to collapse. so a premature baby wouldn't be able to breath properly.