Unani Roots

                            NECROSIS Definition :- Necrosis is defined as a localised area of death of tissue followed later by degradation of tissue by hydrolytic enzymes liberated from dead cells; it is invariably accompanied by inflammatory reaction. Based on etiology and morphologic appearance, there are 5 types of necrosis: coagulative, liquefaction (colliquative), caseous, fat, and fibrinoid necrosis. 1. COAGULATIVE NECROSIS:- This is the most common type of necrosis caused by irreversible focal injury, mostly from sudden cessation of blood flow. 2. LIQUEFACTION (COLLIQUATIVE) NECROSIS:- Lique- faction or colliquative necrosis also occurs commonly due to ischaemicinjury and bacterial or fungal infections but hydrolytic enzymes in tissue degradation have a dominant role in causing semi-fluid material. The common examples are infarct brain and abscess cavity. 3. CASEOUS NECROSIS:- Caseous (caseous= cheese-like) n...