<prompt> What is a first external sign of decomposition of a dead body-eDecomposition of liver and intestineGreenish discoloration over right iliac fossaGreenish discoloration over dependent partsBlood stained froth from mouth  <response>: Ans. is b i.e., Greenish discolouration over right iliac fossa Decomposition of bodyo Produced mainly by the action of bacterial enzymes lecithinase- Cl welchiio Anaerobic organism from bowelso Causes marked hemolysis liquefaction in blood vessels tissue spaces, producing the following changes:Color changes- greenish discolouration over right iliac fossa sulphamethhemoglobin - Over cecum 12-18hrs - spreads over entire abdomen- genitalia- chest- neck- face - arms -legs.Superficial veins over the roots of the limbs, thighs, sides of the abdomen, shoulder, chest neck are stained greenish brown or purplish red, marbled appearance in 36-48 hrs.Foul smelling gases- 6-12 hours in the intestine in summers, due to reduction breakdown of proteins carbohydrates. Gases produced are carbon dioxide, ammonia, methane, mercaptans, and hydrogen sulfide. Gas bubbles cause crepitation give a sponge-like feelingBlood stained froth from mouth nostrils is called post-mortem purge Distension of body: 36-48 hrs Anus uterus prolapse: 2-3 days Postmortum blisters, face distortion: 3 days Nail, skull sutures, hair loss 5daysSkin shows slippage and comes off in a glove Sc stocking fashion.Post mortum luminance due to Photobacterium fischeri bacteria Armillaria mellea fungiLiquefaction of tissues colliquative putrefaction-5-10 daysPutrefactive effusion - pleural cavity 60-100mlSkeletonization occurs in about 1 hourOrder of appearance of putrefaction - larynx, trachea stomach, intestine liver, spleen brain, lungs heart, kidney bladder, uterusprostate skin, muscles, tendon bonesHoneycomb appearance foamy liver seen in the liver is due to putrefactionUterusprostate are last to putrifyEntomology of cadaver: eggs of houseflies are deposited in 6 to 12 hrs in nostrils, mouth; in 8-12 hrs, maggots are produced from eggs; 4-5 days maggots become pupae; flies are formed in 3-5 days. 