<prompt> Nystens rule is for the order ofRigor moisPost Moem stainingAlgor MoisCadaveric spasm  <response>: Nystens law: Nystens law deals with the progression of rigor mois It first affects the involuntary muscles staing with the myocardium The order of appearance in voluntary muscles is: Upper eyelids, Neck muscles, Jaw, Facial muscles, Chest Upper limbs, Abdomen Lower limbs Finger and toes. Order of disappearance is also the same. Rigor mois follows the rule of 12- 12 hrs to set in, remains for 12 hrs, and passes off in 12 hrs. 