Nysten&;s rule is related to
The Order of Appearance of Rigor All muscles of the body, both voluntary and involuntary are affected. It does not sta in all muscles simultaneously (Nysten&;s rule). It first appears in involuntary muscles; the myocardium becomes rigid in an hour. It begins in the eyelids, neck and lower jaw and passes upwards to the muscles of the face, and downwards to the muscles of the chest, upper limbs, abdomen and lower limbs and lastly in the fingers and toes. In individual limbs, it usually progresses from above downwards. Such a sequence is not constant, symmetrical or regular. In individual limbs, it disappears in the same order in which it has appeared. Shapiro (1950) suggests that rigor mois does not follow the anatomical sequence usually described. He suggests that as rigor mois is a physicochemical process, it is most likely to develop simultaneously in all the muscles, although the changes are more easily first detected in the smaller masses than in the larger. The proximo-distal progression is more apparent than real, for the sequence is determined by the bulk and kind of muscle involved. Ref:- k s narayan reddy; pg num:-161
Order of appearance of post moem caloricity
Time since death
Order of appearance of decomposition
Order of appearance of rigor mois
Death and postmortem changes