The classification of cadaveric phenomena (post-mortal changes) generally accepted in scientific forensic medicine is outdated, is based on uncertain and incorrect principles (time and sequence of development), but throughout the long historical period in special literature is subject to practically unchanged and additions, contains contradictory and ambiguously interpreted definitions and terms, and therefore needs to be revision and revised.
 The purpose of the review is to critically analyze and reveal the shortcomings and imperfections of the canonical classification and terminology of cadaveric phenomena, to develop a modern scientifically based classification of cadaveric phenomena, to clarify the terminology of some of them to reveal the shortcomings and imperfections of the canonical classification and terminology of cadaveric phenomena, to develop a modern scientifically based systematization of posthumous changes based on clear classification principles, to clarify and concretize the names of some of them.
 The basic domestic textbooks for higher education institutions and manuals for forensic medical experts and doctors in forensic medicine from 1950 to the present have been studied. The methods of critical analysis and formal logic were used.
 A new forensic medical classification of cadaveric changes depending on their origin (cause of occurrence) has been developed, classification groups are supplemented by previously unaccounted representatives and their terminology with latin names has been optimized. It is emphasized that between these groups there is no regularity and strict sequence in the timing of the onset of development and macroscopic manifestations.
 In the presented new classification, posthumous changes without contradictions and double interpretation are arranged strictly in accordance with the principle of systematization. The proposed improved terms and definitions of some cadaveric changes (processes) are more concrete and expedient.