<prompt> True about Rigor mois:-Does not occur in fetus less than 2 monthsInvolves voluntary muscles onlyLasts for 12-24 hours in summerStas in chin  <response>: Rigor mois involves both voluntary and involuntary muscles, earlier in involuntary muscles. Rigor mois is not seen in Rigor mois is tested by Fetus 2 months Trying to lift eyelids Heat stiffening Lowering the jaw Embalming Bending neck thighs Instrument: Electromyogram 