Cadaveric spasm is instantaneous rigor mortis.

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Quizplus · Accepted Answer

Cadaveric spasm is a temporary stiffening of the muscles that occurs immediately after death. It is caused by the release of calcium ions from the sarcoplasmic reticulum, which triggers the formation of cross-bridges between actin and myosin filaments. Rigor mortis is a more permanent stiffening of the muscles that occurs several hours after death. It is caused by the breakdown of ATP, which leads to the loss of calcium ions from the sarcoplasmic reticulum and the formation of permanent cross-bridges between actin and myosin filaments.

Cadaveric Spasm Is Instantaneous Rigor Mortis