Other Mortis

Liver Mortis

• Definition of Liver Mortis
    - Also known as the "color of death".
    - Refers to the pooling of blood in the body upon death.
    - Blood is normally contained in the body by various processes; upon death, these processes cease, and gravity becomes the primary force acting on the blood.

• Mechanism of Pooling
    - In the absence of a functioning heart, blood ceases to circulate and will pool in the lowest parts of the body due to gravity.
    - Typically, when a person dies and is laid down, blood will accumulate on the backside of the body.

• Appearance of Blood and Skin
    - The pooled blood becomes deoxygenated, resulting in a very dark color (dark purple).
    - Skin where blood is pooled will also take on the same dark coloration.
    - Areas of pressure on the body will appear white due to the entrapment of blood underneath the pressure.
  

• Time Frame for Development
    - Liver mortis typically becomes noticeable a few hours after death.
  

• Types of Liver Mortis
    1. Unfixed Liver Mortis
        - Occurs within the first 8 to 12 hours after death.
        - Blood is still in liquid form, allowing for movement.
        - If the body is moved, new pooling will occur (e.g., flipping the body).
    2. Fixed Liver Mortis
        - Develops after approximately 8 to 12 hours postmortem.
        - Blood congeals, resulting in a gelatinous consistency and will not shift with movement.
        - Blanching Test:
            - Pressing on the skin and observing if it returns to normal color indicates unfixed liver mortis; if it stays white, the blood is fixed.

• Utility in Investigations
    - Liver mortis helps estimate the position of the body at the time of death and whether it has been moved.
    - If there are areas of discoloration on a side that should not have been affected (e.g., back is on the ground), this suggests movement occurred after death.

• Factors Influencing Appearance
    - Body position (e.g., fetal position may cause irregular pooling).
    - External factors, such as poisoning (e.g., carbon dioxide poisoning affects blood color).

• Visual Representation
    - Photos demonstrate liver mortis:
        - One side may display dark pooling while the opposite shows blanching where pressure was applied.
        - Specific instances where blood has pooled due to body positioning.

• Congealed Blood
    - After 8-12 hours, blood inside the body may turn to a gel-like substance due to loss of oxygen and the presence of platelets, which affect blood thickening.
    - Appearance in organs like the heart shows pooling and congealing leading to a solid gellified state.

Algor Mortis

• Definition of Algor Mortis
    - Refers to the cooling of the body after death.
    - It is a process used in forensic investigations to estimate the time of death based on body temperature.
  

• Cooling Rate
    - Body temperature decreases approximately 1.5 degrees Fahrenheit per hour after death.
    - The body will continue to cool until it reaches ambient temperature.
  

• Variables Affecting Cooling
    - Environmental conditions (temperature, wind) significantly impact the cooling rate.
    - Characteristics of the deceased, such as body fat percentage and clothing, also play a role.
  

• Practical Use
    - Algor mortis methods can provide accurate estimates of the time since death, especially within the first few hours.
    - Typically, methods become less reliable after 24 hours postmortem.

• Equation for Estimation
    - While the exact formula was not memorized, forensic experts can calculate the approximate time of death using specific physical measurements related to cooling.

Summary and Connection Between Concepts

• Both liver mortis and algor mortis are vital indicators in forensic science for estimating the time of death and the state of a corpse.

• Liver mortis informs investigators about the position at death and any postmortem movements, while algor mortis aids in estimating the elapsed time since death by assessing body temperature.

• Understanding these processes provides essential insights into the circumstances surrounding a death and assists medical examiners in their investigations.