Stage 3: Rigor Mortis

October 1, 2015 — 6 Comments

Corpse in morgue displays signs of Rigor Mortis

The third stage of decomposition known as “Rigor Mortis” translates to “stiffness” [rigor] “of death” [mortis]. The stiffness in a body during the phase of Rigor Mortis is caused by a build up of lactic acid which causes chemical changes within muscles. In life, lactic acid, also known as “milk acid” plays various roles in a body’s biochemical process. The myosin and actin (proteins involved in muscle movement) in the body then begin to harden, causing all muscles in the body to harden for a period of time, as well. At the time of death, “primary flaccidity” occurs and Rigor Mortis begins within 2-6 hours of death, starting with the eyelids, neck and jaw before spreading throughout the rest of the body over the following 4-6 hours. Sometimes all the hardening and contracting of muscles can cause an involuntary postmortem ejaculation in a male corpse. The exact onset and rate of completion of this stage is determined by many factors including age, gender, body type and muscle build; For instance, Rigor Mortis may not be perceivable in infants and children who lack muscle mass. Rigor Mortis may develop more quickly if cause of death is an infection, terminal seizure, electrocution or if the deceased has recently engaged in strenuous exercise or had a higher than average body temperature caused by fever, drugs or intoxication. Generally, 36-48 hours after death “secondary flaccidity” occurs when bacteria in the body begins eating away at the deceased from the inside out, causing the body to end Rigor Mortis and loosen again as muscle tissue begins to deteriorate. Sometimes, it can take 72 hours for the body to reach secondary flaccidity. In a warm environment, Rigor Mortis tends to dissipate sooner than average, whereas in a cold climate, the effects may persist longer.
Check out the NEW BOOK by The Post-Mortem Post’s Head Writer ‘Horrible History: Mass Suicides’ AVAILABLE NOW on Amazon Kindle!

Find out what happens prior to Rigor Mortis, Stage 1: Pallor Mortis and Stage 2: Algor Mortis and after Stage 4: Livor Mortis

If you enjoyed this article, you may also like Everybody Poops: The Post-Mortem Edition and Demystifying the Process of Dying

Stage 4: Livor Mortis

October 1, 2015 — 6 Comments

The fourth stage of decomposition, Livor Mortis translates to “blueish color” [livor] “of death” [mortis] although it has many names including “hypostasis”, “suggillation”, “cadaveric lividity”, “darkening of death” and “postmortem staining”. Livor Mortis begins when circulation stops, blood vessels become more permeable due to decomposition, and blood settles throughout the corpse. Red blood cells, which are very dense, travel and pool in the lowest areas possible, staining the tissue. This means in a hanging death, discoloration would be seen in the feet, fingertips and ear lobes. Males who die from hanging may also acquire what’s known as a “Death Erection” (or “Angel Lust”) due to the pooling of blood in their penis.

Death Erection

In someone who died in the supine position (lying face up), lividity would appear on the corpse’s back. Drowning victims, or bodies found in water show signs of Livor Mortis in the face, upper parts of the chest, hands, lower arms, feet and calves because they are in constant motion. Livor Mortis begins within 20 minutes to 2 hours of death and initially causes the skin to appear blue and blotchy. Blood congeals in the capillaries within 4-5 hours and in 5-6 hours, blotches on the skin become more fluid. At this time, if pressure is applied to the discolored area(s), skin will turn white. Maximum lividity can be observed between 6-12 hours, and after 10-12 hours, skin will retain discoloration even when pressed. The name is slightly misleading as it tends to appear more of a blueish-purple or purple-ish red in most cases. Certain poisons alter the color of postmortem staining, which can aid in determining cause of death. In a carbon monoxide poisoning death, discoloration would be a cherry pink. Hydrocyanic acid poisoning appears bright red, and nitrates, potassium chlorate, potassium bicarbonate, nitrobenzene and aniline (which causes methaemoglobinaemia) all manifest as a red-brown or brown discoloration. Phosphorus poisoning causes dark brown postmortem staining. Discoloration is especially evident on the ear lobes and underneath fingernails and in fair-skinned people. Intensity of the color depends on the amount of hemoglobin in the blood of the deceased and hypostastis can be internal as well as external, often manifesting on the heart, lungs, kidney, spleen and other organs. During later stages of Livor Mortis, the body may also begin to show “marbling”, which is caused by the breakdown of hemoglobin.

Marbling

Tardieu Spots

Corpses in the later stages of Livor Mortis may also develop “Tardieu spots”, which look like purple liver spots. These dark spots are created by ruptured capillaries. In addition, “vibices” are often visible on bodies during the stage of Livor Mortis. Vibices look like strips or bands and are caused by pressure, usually left by tight-fitting clothing such as socks, belts and bras. In hanging deaths, a noose or other method of hanging may be visible in the form of a vibice. When pressure is applied to the corpse, it prevents blood from pooling in those areas.

Vibices seen on corpse. Lividity suggests corpse was in supine position at time of death.

Petechiae, larger haemorrhages or palpable blood blisters may form on patches of discolored skin. The subtle differences between postmortem staining/haemorrhages and bruising obtained in a fatal accident or murder is evident to investigators when determining cause of death. The discoloration caused by pooling of blood in the vessels appears slightly different from bruises which are formed when blood escapes the vessel. Livor Mortis is incredibly useful in determining whether a body has been moved after death. For example, if a body is livor on the back, indicating they died in the supine position but are discovered in prone position (face down), it is evident someone move the body. Signs of the fourth stage of decomposition are also a tale-tell sign that resuscitation is futile.
Check out the NEW BOOK by The Post-Mortem Post’s Head Writer ‘Horrible History: Mass Suicides’ AVAILABLE NOW on Amazon Kindle!

Find out what happens before Livor Mortis in Stage 1: Pallor Mortis, Stage 2: Algor Mortis, and Stage 3: Rigor Mortis and after Stage 5: Putrefaction

If you enjoyed this article, you may also like Everybody Poops: The Post-Mortem Edition and Demystifying the Process of Dying

Stage 6: Decomposition

October 1, 2015 — 4 Comments

Decomposing corpse from Sally Mann’s series, ‘Body Farm’

In the 6th stage of decomposition, true decomposition or “biotic decomposition”, takes place. Biotic decomposition is breakdown of the body’s components into smaller and smaller components until the organic body is gone. This process is caused by living organisms, usually microorganisms. When the body is broken down by other, faster means such as cremation, alkaline hydrolysis/resomation, promessa, or other physical/chemical process, it is refered to as “abiotic decomposition”. The speed and success of biotic decomposition, as with most stages of the decomposition process, relies on many factors. Generally speaking, conditions which aid in the previous stage, Putrefaction also aid in biotic decomposition. The amount of bacteria in the body at time of death and ability to produce more bacteria postmortem plays a large role. For instance, if you eat a lot of meat, your corpse will contain and produce higher levels of bacteria than a vegan. The bodies of deceased newborns who have never been fed decompose very slowly because in most cases, they are “sterile”, or mostly void of bacteria in their system. However, if a newborn passes away but has been fed, their body tends to decompose much faster than average. If a corpse has been mutilated or obtained large, open wounds decomposition will take place more quickly because it allows easy entry for insects and microorganisms whereas clothing may slow the process. If a body is buried after beginning to decompose somewhat, it will complete more quickly than if the body was buried soon after death. Embalming will delay the process, as is its function, but if the body is left to the elements in open air with scavengers nearby to help the body breakdown, decomposition will complete very rapidly.

Decomposing corpse from Sally Mann’s series, ‘Body Farm’

Decomposition begins and ends slower in water than in open air. Warm, fresh and/or stagnant water aid slightly in the process, while cold water, salt water and/or running water slow decomposition. Deep water may cause a delay in the onset of biotic decomposition. Water contaminated by sewage will speed up the process. When in water, the skin on the hands and feet of the cadaver may become swollen and bleached. Within 2-4 days, “sleeving” becomes possible. Sleeving, also called “skin slippage”, refers to the loosening of decaying skin to the point that it will slough off in one piece, or made able to pull off as though it were a sleeve. After several weeks in the water, this skin can easily by stripped off, or sleeved, by the current or contact with objects such as rocks. Once skin slippage begins and the upper layer of epidermis has been sleeved off, it is incredibly difficult, if not impossible to obtain fingerprints in order to identify the deceased. Mold can also begin to form on a deceased body in water or a moist area, but usually only on exposed patches of skin. Generally, bodies left in water do not remain intact long due to crustaceans, fish, and water rats feeding on the corpse. “Casper’s Law”, also known as “Casper’s Ratio” suggests that if all other factors (clothing, contents of digestive system, lesions/abrasions, weather conditions, temperature, etc) is equal, bodies with free access to open air decompose twice as fast as in water, and eight times as fast as when buried.

Decomposing corpse from Sally Mann’s series, ‘Body Farm’

Find out what happens before Biotic Decomposition in Stage 1: Pallor Mortis, Stage 2: Algor Mortis, Stage 3: Rigor Mortis, Stage 4: Livor Mortis and Stage 5: Putrefaction
and in the final stage of decomposition, Stage 7: Skeletonization

Check out the NEW BOOK by The Post-Mortem Post’s Head Writer ‘Horrible History: Mass Suicides’ AVAILABLE NOW on Amazon Kindle!

See more of Sally Mann’s series Body Farm

If you enjoyed this article, you may also like: Everybody Poops: The Post-Mortem Edition, Demystifying the Process of Dying and Burying the Dead is Killing the Planet

Stage 7: Skeletonization

October 1, 2015 — 3 Comments

Partially skeletonized corpse. Decomposing skin remains in some areas.

The 7th and final stage of decomposition, skeletonization, begins when soft tissue has dried and decayed to the point that parts of the skeleton are visible. Skeletonization is complete once all tissue has decomposed and all that is left of the corpse is bone. Remains may become reduced to bone in as little as three weeks but can take up to several years. Factors including temperature and environment determine the timeline of skeletonization. In a tropical climate the body may be reduced to bone in just a few weeks, in tundra, the process will take several years. Skeletonization may never occur if the corpse is in an environment with persistent subzero temperatures as seen in bodies left behind on Mt. Everest.

Body of George Herbert Leigh Mallory on Mt. Everest. Died on British expedition in 1924. His corpse (discovered May 1,1999) remains in pristine condition to this day due to extreme cold. Photo courtesy Atlas Obscura.

Instead of decomposing, remains of climbers who perished have been preserved due to the extreme cold and now act as trail markers up the treacherous mountainside. The bodies of those who die on Mt. Everest usually remain because an attempt to reach and recover the corpse would most likely prove to be unsuccessful, possibly resulting in another fatality. When the corpse is left in a peat bog or salt desert, skeletonization may be delayed, or natural embalming or spontaneous mummification can occur. The body may saponify, or become “adipocere” if left in certain environments, including a peat bog. This is a rare form of spontaneous mummification seen in the Mutter Museum’s “Soap Lady” who saponified in an alkaline, warm environment which was lacking air. While it is not common, it is possible for a corpse to undergo skeletonization in one area of the body, while experiencing some form of natural preservation in another.

The Soap Lady, who died circa 1830 and was

The Soap Lady saponified, causing the corpse to become a soapy, wax-like substance called adipocere. Photo courtesy of the Mutter Museum.

In an area void of scavenging animals, bodies buried in acidic soil will take approximately 20 years to complete skeletonization and for bone to decompose to the point that practically no evidence of the body is left. In soil with a neutral PH level, a corpse can last as long as 100 years before bone has decayed almost completely. There is also a possibility bone may not deteriorate and the skeleton could instead become a fossil or crude oil.