What is autolysis?
self-digestion or degradation of cells a nd tissues by hydrolytic enzymes normally present in tissues
What is somatic death?
- due to total diffuse hypoxia
- cells degenerate as described for hypoxic cell injury
What is putrefaction/ decomposition?
process by which post mortem bacteria break down tissues
- gives color, texture changes, gas production, and odors
What tissues undergo autolysis first?
those with greater proteolytic enzymes:
- GI tract
- gall bladder
What does morphologic appearance of postmortem changes depend on?
- cause of death
- environmental and body temperature
- microbial flora
In ruminants, what continues despite death?
ingesta will continue to undergo bacterial fermentation, producing gas and heat
If rigor mortis has not set in after an hour, what should you be cautious of?
anthrax, do not do necropsy
what is rigor mortis?
contraction of muscles after death
- occurs 1-6 hours after death and lasts for 1-2 days
describe a post mortem clot?
- unattached to vessel walls
- shiny and wet
- perfect cast of vessel lumina
How does hemoglobin imbibition occur?
Hg is released by lysedd red blood cells and penetrates the vessel wall and extends into the adjacent tissues
What is bile imbibition?
bile in the gall bladder starts to penetrate the wall and stains the adjacent tissue to a yellow/green/ brown color
What is pseudomelanosis?
refers to greenish-black doscoloration of tissues post mortem
- decompostion of blood by bacterial action forming hydrogen sulfide with iron