Following death, the human body progresses through five basic stages of decomposition. The duration and degree of each stage is largely influenced by the environment (temperature, humidity, etc.), body mass, any wrappings or coverings of the body, and obviously scavenging or other post-mortem disturbances. Additionally, submerged or buried bodies will decompose much differently than bodies left on the ground. This is what I will be referring to below. Here are the general descriptions of the five stages of decomposition:
The fresh stage begins immediately after death when the circulatory system (heart beating/pumping blood) stops functioning. It is during this stage that the blood will settle with gravity creating a condition known as lividity. After several hours the muscles will also begin to stiffen in a process known as rigor mortis. The body temperature will also begin to acclimate to the environment. Cells will begin to break down and release enzymes during a process called autolysis which can cause blisters on the skin. The anaerobic organisms in the digestive tract will begin to multiply, producing acids and gases (the source of the bad odors). This process is often referred to as putrefaction.
As the name implies, the gases being produced during putrefaction begin to build and will give the body a distended appearance. Gases and fluid will eventually escape through the natural orifices as the pressure builds. As the gastrointestinal bacteria multiply and can lead to conditions like marbling which is a discoloration pattern seen in the skin. You may also see green discoloration in the abdomen areas and eventually a darkening (blackish) coloring of the skin overall as the process advances. Interestingly enough; I remember one time I was giving a lecture on forensic entomology at a college campus and after the lecture a serious looking young black student approached me. She asked me why I only showed pictures of black victims in my presentation. I was a bit taken back and briefly confused as I ran through a mental recap of the cases I presented. I finally told her that all of the victims were in fact white (Caucasian) in life but due to this process their skin darkened. It was an eye-opening experience and I made sure to describe this process more effectively when lecturing the public.
During his phase the body begins to lose much of it’s fluids and mass (tissue) through purge and insect and/or vertebrate scavenging (coyote, fox, lion, etc). During this phase you may see very large maggot masses and notice a considerable increase in foul odors.
This phase is the end of the active decay process. Temperatures can either speed up (heat) or slow down (cold) how quickly a body reaches this phase. The body has very little body mass and soil staining of the surrounding soils is still evident. This soil staining (from body fluids) may actually kill some of the surrounding vegetation temporarily. Maggots will migrate away from the body to pupate and flies will cease laying eggs.
This phase is the last measurable stage of decomposition. The timing of this stage varies widely by environment. For example, a body in Florida in July (hot/humid) may reach this stage in a week while in the Winter in the Rocky Mountains (cold/arid) it might take months. If there is any skin left it will be leather-like and very tough. Mostly the body is reduced to bones and connective tissue. There is no biomass available for diverse insect colonization. Some beetles and adventitious insects may colonize a body for shelter or feeding on other insects and connective tissue. Over time the bones may “bleach” (turn white) with exposure to sunlight and eventually will begin to exhibit cracks after several years. These weathering cracks are distinctive and would not be confused with a fresh break (injury) unless by an inexperienced analyst.
Small Amounts Over A Long Periode Of Time #2 (2012) and #1 (2011)
Wild Boar Skull
Domestic Cat Skull
“I feel my heart ache, but I’ve forgotten what that feeling means.” -Chuck Palahniuk, Choke
Image credit: Kevin Curtis/Getty Images
Gross dissection of the rat brain
These are the remnants of what we did in school the other day. Teacher told us we shouldn’t post these on the internet but what’s he gonna do to me, sue me ? Yeah, he probably could, actually.
Created using real human tissues, these bone china histology dessert plates are 8” diameter and available in 4 different human tissue designs:
Medical illustrator and artist, Emily Evans, made these gorgeous plates from original slides of various human tissues provided by Michelle Spear, Clinical Anatomist at Cambridge University. The plates were then fired by ceramic artist, Emma Smith.
Alexander Baker’s Medical Illustrations
1. Chronic Pelvic Pain
When skin is meshed, it doubles its size and surface area as a surgical covering. The holes also help with evacuation of liquids during healing.
Photo: Mar Cabra