Alexei Volkov
Dead bodies undergo a series of biological changes, collectively referred to as decomposition. During the bloat stage, gases produced by bacteria cause the body to swell significantly, and skin blisters form, creating a glossy sheen. The body also becomes stiff due to chemical changes in the muscle fibres, and the skin loosens. These factors may contribute to the plastic-like appearance of dead bodies.
| Characteristics | Values |
|---|---|
| Skin | Pale/yellowish/grayish/waxy |
| Eyes | Half closed |
| Mouth | Open |
| Lips | Seem to shrivel |
| Size | Smaller than when alive |
| Body | Unnaturally still |
| Skin | Blisters form, creating a glossy sheen |
| Skin | Outer layer loosens |
| Body | Swells significantly due to gas buildup |
| Body | Odor |
| Skin | Moisture, pH levels, and oxygen availability can influence the rate of decomposition |
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What You'll Learn
Skin changes: discolouration, blistering, and waxy texture
Human decomposition is a natural process involving the breakdown of tissues after death. The skin undergoes various changes during this process, including discolouration, blistering, and a waxy texture.
Discolouration is one of the first visible signs of decomposition, typically occurring within the first few hours after death. The skin may take on a pale, yellowish, or greyish hue, depending on the individual's physiology and cause of death. For example, gunshot victims tend to exhibit yellowish discolouration. As decomposition progresses, the accumulation of abdominal gases can cause the body's skin to change colour further, usually around 8-10 days postmortem.
Skin blistering is another early sign of decomposition. Blisters form due to the creation of a glossy sheen on the skin's surface, resulting from the breakdown of soft tissues. The outer layer of skin loosens, and the body begins to swell during the bloat stage.
The skin of a decomposing body may also take on a waxy texture, sometimes referred to as "corpse wax" or "grave wax." This substance, known as adipocere, forms only in moist environments and in the presence of anaerobic bacteria, which break down fat through hydrolysis. Adipocere contributes to the preservation of the body's soft tissues, slowing down the decomposition process.
Additionally, dehydration resulting from environmental factors such as heat, wind, or drafts can lead to the desiccation and brittleness of the skin. The internal organs may also be affected by dehydration, resulting in mummification. Conversely, in humid conditions, the skin may liquefy, causing hair, bones, and cartilage to remain intact.
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Body stiffens, then softens
The human body undergoes a series of biological changes after death, collectively referred to as decomposition. Decomposition involves the breakdown of tissues, with four key stages: autolysis, bloat, active decay, and skeletonization.
One of the most noticeable changes is the stiffening of the body, known as rigor mortis, which occurs within 3-8 hours after death. This is caused by a range of chemical changes in the muscle fibres, resulting in the body becoming stiff and cold. However, this state is not permanent, and after approximately 36 hours, the chemical bonds that caused the stiffness break down, and the body softens again. This softening is due to the destruction of soft tissues by bacterial action, which can result in the seepage of body fluids from orifices and the liquefaction of skin, muscles, and organs.
Rigor mortis is a result of normal biological functions stopping, particularly the cessation of blood flow and the cooling of the body. As the body stiffens, skin blisters may form, creating a glossy sheen, and the outer layer of skin may loosen. During the bloat stage, gases produced by bacteria cause the body to swell significantly, which can lead to foam leakage from the nose and mouth.
The timeline for the decomposition process can vary depending on environmental factors such as weather, temperature, moisture, pH levels, oxygen availability, cause of death, and body position. For example, heat and insect activity can speed up decomposition, while cold temperatures or wrapping the body in plastic can slow it down. Additionally, the presence of multiple bodies within a single grave, as in mass graves, can affect the rate of decomposition due to the proximity of the bodies.
The visual signs of decomposition can be uncanny, with subtle differences between a person who is sleeping and one who is dead. These signs can include an open mouth, half-closed eyes, and shrivelled lips that no longer cover the teeth. The body may also appear smaller, and the skin may take on a waxy appearance, with a pale, yellowish, or greyish hue.
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Active decay: liquefaction of skin, muscle, and organs
Decomposition is the process by which the organs and complex molecules of animal and human bodies break down into simple organic matter over time. In vertebrates, five stages of decomposition are typically recognized: fresh, bloat, active decay, advanced decay, and dry/skeletonized. The rate of decomposition varies due to environmental factors such as temperature, burning, humidity, and oxygen availability, as well as other factors like body size, clothing, and cause of death.
Active decay is the third stage of decomposition, following "bloat." During active decay, the soft tissues of the body collapse in on themselves, and the skin, muscles, tendons, and ligaments degrade, exposing the skeleton. This is when liquefaction of the skin, muscle, and organs occurs. The body's proteins are broken down into smaller components, and bacteria excrete gases and organic compounds, resulting in a notable bloating of the torso and limbs. The increased internal pressure caused by the rising volume of gas further stresses, weakens, and separates the tissues.
Putrefaction is one of the seven stages of decomposition, and it involves the decomposition of proteins and the eventual breakdown of the cohesiveness between tissues, leading to the liquefaction of most organs. Putrefaction is caused by the decomposition of organic matter through bacterial or fungal digestion, which releases gases that infiltrate the body's tissues and contribute to their deterioration. The rate of putrefaction is influenced by factors such as environmental temperature, moisture, air exposure, clothing, burial factors, and light exposure.
The skin, muscles, and internal organs are particularly affected during active decay and putrefaction. Skin can undergo necrosis, or tissue death, due to illness, infection, injury, disease, or lack of blood flow. Skin necrosis (gangrene) can be caused by bacterial infections and commonly affects fingers, toes, hands, and feet. Gangrenous necrosis causes the skin to appear black and begin to rot.
The muscles are also affected, with chemical changes in the muscle fibres causing the body to stiffen and then soften again as the chemical bonds break down. This softening is due to the destruction of soft tissues by bacterial action. The internal organs can undergo liquefaction, with the soft tissues breaking down and the skeleton being gradually exposed. The organs may also be subject to putrefaction, which can result in the release of foul-smelling chemicals and gases.
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Insect activity and bacterial contamination
The bacterial breakdown of fat tissues, muscles, and food remnants in the stomach also helps predict the time since death. Bacteria produce certain chemicals during decomposition that attract insects. These chemical signals, along with the availability of food sources, influence where flies lay their eggs.
The decomposition process is influenced by various factors, including temperature, climate, and the presence of other bodies. Heat and insect activity accelerate decomposition, while cold temperatures or wrapping a body in plastic slow it down. The rate of decomposition in buried human bodies is also affected by the acidity or alkalinity of the soil.
The microbial communities involved in decomposition turn the body into an ecosystem of its own. Different insects arrive and depart from the corpse at various stages of decomposition, feeding on the body and each other. This dynamic process makes it challenging to determine the exact time since death, but forensic scientists can narrow down the timeframe by studying the insects and microbes present.
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Environmental factors: temperature, moisture, pH levels, oxygen availability
Environmental factors play a crucial role in understanding the changes a dead body undergoes. Temperature, moisture, pH levels, and oxygen availability all influence the rate and nature of decomposition.
Temperature significantly affects the decomposition process. Heat, for instance, accelerates decomposition, leading to dehydration and desiccation of the skin, while also affecting the internal organs. Conversely, cold temperatures slow down the process, preserving the body for a more extended period.
Moisture is another critical factor. In moist conditions, the presence of anaerobic bacteria can lead to the formation of a waxy or soap-like substance called "corpse wax" or "grave wax." This substance is the result of the bacterial decay of fat, which produces adipocere through hydrolysis.
The pH levels of the environment, such as the acidity or alkalinity of the soil, also influence the preservation of bones in buried bodies. Alkaline environments can accelerate bone degradation, while acidic conditions may preserve them.
Lastly, oxygen availability plays a role in decomposition, particularly in the case of cremation. The cremation process generates carbon dioxide, contributing to carbon emissions. However, alternative methods like alkaline hydrolysis, or "water cremation," are emerging as more environmentally friendly options that do not rely on the combustion of fuel.
While the visual aspects of why dead bodies may appear plastic are not explicitly mentioned in the sources, the environmental factors outlined above undoubtedly influence the overall appearance and state of a corpse over time.
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Frequently asked questions
Dead bodies can look waxy due to the formation of a substance known as 'corpse wax' or 'grave wax', which occurs in moist conditions when anaerobic bacteria decay fat and produce adipocere.
Skin blisters can form during the decomposition process, creating a glossy sheen on the skin.
Dead bodies can appear smaller due to muscle relaxation and the subsequent shrinking of the lips and mouth, which can make the teeth appear more prominent.
Gunshot victims may appear yellowish due to physiological changes that occur after death.
