Nystens Law

 

                                                                           Pierre Nysten 

The Nysten Rule (or Nysten’s Law) is a principle in forensic medicine that describes the order of appearance of rigor mortis (postmortem rigidity) in the human body.

🔍 Definition of Nysten Rule:

Formulated by Pierre-Hubert Nysten in 1811, the rule states that rigor mortis sets in following a top-to-bottom sequence in the body, specifically:

1. Face (eyelids, jaw)

2. Neck

3. Upper limbs (shoulders → arms → hands)

4. Trunk

5. Lower limbs (thighs → legs → feet)

📈 Sequence Explained:

• Rigor begins in the small muscles, such as those of the eyelids and jaw, and then progresses to larger muscle groups.

• This caudo-cephalic regression (reverse order) is seen when rigor mortis resolves 

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