Which part of the body is the first to be affected by rigor mortis?

Rigor mortis is a postmortem change that results in the stiffening of the muscles due to biochemical processes that occur in the body after death. The first area of the body to show signs of rigor mortis is the small muscles, particularly those in the face and around the eyes. This includes structures that control the eyelids and facial expressions, leading to the appearance of fixed eyelids and a distinctive facial expression.

Understanding that rigor mortis begins in the smaller muscle groups helps illuminate its progression through the larger muscle groups afterward, typically moving from the head and neck down towards the limbs. In this case, the eyes are initial indicators of rigor mortis manifestation, as they reflect the body's state shortly after death. This physiological change is key for professionals in the field of funeral service, as it can impact the preparation and viewing of the deceased, where a natural appearance is important for the bereaved.