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# Aim: SWBAT describe the stages of decomposition of a corpse PowerPoint PPT Presentation

Aim: SWBAT describe the stages of decomposition of a corpse . Date: May 7, 2013 Do Now: Get out the worksheet from yesterday. Calculate the time of death for a body found at 26° C. 16 hours and 12 minutes. Solution. Homework Review Decomposition Introduction Eye Changes

Aim: SWBAT describe the stages of decomposition of a corpse

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## Aim: SWBAT describe the stages of decomposition of a corpse

Date: May 7, 2013

Do Now:

Get out the worksheet from yesterday.

Calculate the time of death for a body found at 26° C.

• 16 hours and 12 minutes

### Solution

• Homework Review

• Decomposition Introduction

• Eye Changes

• Stages of Decomposition

• Red Light

### Agenda

• 5 hours

• Before 5 hours

• 14 hours 14 minutes

• 31 hours 42 minutes

• 57 hours 24 minutes

• 9 hours 42 minutes

• 16 hours 36 minutes

• A) Reduce

B) Reduce

C) Increase

D) Reduce

### Homework Review

• Breakdown of tissue, organs, and other remains

### Decomposition

• Eye dries out, thin film forms over it

• Forms within 2-3 hours if open at death, 24 hours if closed

• Potassium buildup in the eye

### Changes in the eye

As forensic scientists, how can we utilize the information from sites like the body farm in our investigation?

### Stages of Decomposition

• Within two days (Initial Decay)

• Livor Mortis

• Discoloration in face

• Marbling of skin

• Cell Death

### Stages of Decomposition

• Four days ( Putrefaction)

• Blisters

• Stomach swells with gas from bacteria

### Stages of Decomposition

3. 6 – 10 Days (Black Putrefaction)

a. Gases build up

b. Chest and Stomach burst and collapse

c. Fluids leak from body

d. Eyes liquefy

e. Skin sloughs off

### Stages of Decomposition

4. After 10 days (Butyric fermentation)

a. Corpse starts to dry out, flesh is gone

5. Eventually (Dry decay)

a. Corpse is dry, little decay