Nysten's rule peains to -
Nysten's rule states that Rigor mois does not sta in all muscles simultaneously, it appears first in involuntary muscles. Ref: K.S.Narayan Reddy's Synopsis of Forensic Medicine and Toxicology, 29th edition, Chapter 7, Page 88.
Rigor mois
Identification
Bullet injuries
Putrefaction
Death and postmortem changes