11- Postmortem changes
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Created by:
heglea Plus on July 4, 2012
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Exam 2
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24 terms
Terms | Definitions |
|---|---|
 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 - pancreas - gall bladder |
| What are some organs of rapid autolysis? | liver and kidney |
| What does morphologic appearance of postmortem changes depend on? | - cause of death - environmental and body temperature - microbial flora |
| What effect does cool temp/ refrigeration have on autolysis? | inhibits it |
| 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 |
| What can accelerate the onset of rigor mortis? | high heat and high activity before death |
| what is algor mortis? | cooling of the body post mortem, depends of the Temp of body at time of death |
| what is livor motis? | - hypostatic congestion - gravity will pull blood post death |
| Describe a pre mortem clot? | - attached to vessel walls (arteries - dry and duller color - laminated |
| describe a post mortem clot? | - unattached to vessel walls - shiny and wet - perfect cast of vessel lumina |
| What is hemoglobin inhibition? | red staining of tissue, especially the heart, arteries and veins |
| 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 organs are normally are stained by bile imbibition? | liver and intestines |
| What is bloating? | results from postmortem bacterial gas formation in the lumen of the GI tract |
| Who bloats faster? herbivores or carnivores | herbivores |
| After death, why does clouding of the lens occur? | due to cold temps of the carcass |
| What is pseudomelanosis? | refers to greenish-black doscoloration of tissues post mortem - decompostion of blood by bacterial action forming hydrogen sulfide with iron |
| Where does pseudomelanosis normally occur? | - soon after death - seen in tissues in close contact with the gut wall |
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