Question

1st affected in rigor mortis:

• A. Eyelids
• B. Myocardium
• C. Jaw
• D. Neck

Answer 1

The Correct Option is B

Rigor mortis is the postmortem stiffening of the muscles, which occurs due to biochemical changes in the muscles after death. The onset of rigor mortis typically follows a specific pattern: it begins with the smaller muscle groups and progresses to the larger ones.

The question pertains to identifying the first muscle group affected by rigor mortis.

Explanation:

• The myocardium, which refers to the muscular tissue of the heart, is unique as it can start to stiffen relatively quickly compared to other muscle groups. Due to the heart's constant activity during life, chemical changes trigger rigor mortis early in the myocardial tissue.
• Comparatively, rigor mortis in skeletal muscles such as the eyelids, jaw, or neck typically follows the onset in the myocardium.

Conclusion: The first affected muscle group in rigor mortis is the myocardium.