Decomposition of Human Body This ppt contains graphic images.

5 stages of decomposition Initial decay Putrefaction Black putrefaction Butyric fermentation Dry decay

Initial Decay 0-3 days after death Bacteria in digestive tract start eating intestines, break through and begin feeding on surrounding organs Individual cells break down, (autolysis) releasing cell contents into body

Putrefaction 4-10 days after death Body will be bloated from build-up of gases released by bacteria living in intestines Skin blisters Build-up of fluids from ruptured cells and intestines Skin begins slipping stinks

Putrefaction

Black Putrefaction 10-20 days after death Body begins to collapse and black surfaces are exposed Bloated body collapses and leaves a flattened body Loss of body fluids from body

Black Putrefaction

Butyric Fermentation 20-50 days Little to no flesh and body dries out Cheesy smell (caused by butyric acid) Surface of body in contact with ground may mold as body ferments

Butyric Fermentation

Dry decay 50-365 days after death Body is dry and continues to decay very slowly because of lack of moisture Mostly reduced to hair and bones Eventually the hair will disappear

Dry decay

Picture of lividity

Questions What factors do you think would speed up/slow down the rate of decomposition? How does the state of decomposition assist scientists in determining time of death?