Necrosis

(nek-ro' -sis). The death of cells surrounded by living ti ue. Necrosis proper refers to death in ma , necrobiosis to death of individual cells. Among the causes of necrosis are: (i) direct injury; obstruction of the circulation; lo of trophic influence. The varieties of necrosis are: (i) coagulative necrosis; liquefactive necrosis; cheesy necrosis; dry and moist gangrene. See Gangrene . Necrosed ti ues may be absorbed, retained, or thrown off. The dead ti ue is called sequestrum in case of bone, and sphacelus in case of soft parts. In surgery the term necrosis is often applied specifically to the death of bone. N., Anemic. See infarct. Anemic. N., Caseous. See Cheesy . N., Balser's Fatty, poisoning with mercury. N., Phosphorus, a necrosis of bone, especially of the lower jaw, occurring in those exposed to the fumes of phosphorus. N. of the Teeth, odonto-necrosis. By the term necrosis, when applied to the teeth, is meant the entire death of the pulp and the lo of vitality of the per i dental membrane. N. ustilaginea, dry gangrene from ergotism.