All are true about rigor mortis EXCEPT: (AIPG 2011)
|A||Distal to proximal spread|
|B||Usually first involves iris and jaw muscles|
|C||Becomes fully established by 4-9 hours|
|D||Starts to fade off by 16-24 hours|
Distal to proximal spread
a. Order of appearance: First appears in involuntary muscles (heart) →voluntary muscles → upper eyelids → neck →jaw → face →chest → upper limbs →abdomen → lower limbs.
b. Begins 1 - 2 hrs after death and takes further 2 hrs to develop.
c. Lasts 18 – 36 hrs in summer and 24 – 48 hrs or even more in winter.
d. No rigor mortis- Foetus < 7 mths, Heat stiffening, Embalming.
e. Rigor is tested by- trying to lift eyelids, depressing the jaw, bending neck and thighs, and noting if it is absent, partial, complete, passing phase or passed-off.