Last of the Lecture notes for 111 (exam 4) Flashcards Preview

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1

One of the basic necessities for bacterial growth, water, has been eliminated from the body.

  • Environment- hot dry desert or cold mountainous regions with dehydrated air with perma frost will desiccate bodies.

Permanent Preservation (Mummification)

2

  • Adipose tissue formation
  • Facial features swollen beyond recognition
  • Intense odor of putrefaction
  • Protruding eyes and tongue
  • Massive skin slip (desquamation)
  • Blue-black streaked with red in color (marbleized)
  • Purge from all orifices
  • Hair, finger nails, and toe nails have dropped off or are loose.
  • Intense odor of ammonia

Characteristics of a wet or dry floater

3

A fetus dies in the uterus and remains enclosed in the amniotic sac. In a much broader sense, it could refer to the moistening and softening of any tissue decomposing in a liquid medium.

Maceration

4

The extreme or complete dehydration of a body so as to form a dry, brown, hard structure which is light in weight and resistant to decomposition.

Mummification 

5

A two-step reaction involving the removal of the amino grops from amino acids (refer to protein break down).

Deamination

6

With the help of oxygen, atoms of carbon and oxygen are pulled off the molecular structure. This reaction is associated with decay.

(removes the carboxyl group from an amino acid)

Oxidative Decarboxylation

7

A modification of putrefaction which is characterized by the transformation of certain fatty tissues of the body into a substance known as adipocere tissue or grave wax.

Saponification (Adipocere formation)

8

  • Has a greasy, slimey feel.
  • It is either pure white or pale yellow in color
  • Has the odor of decayed cheese.
  • It is highly reisistant to putrefactive organisms. Instead of decomposing, it turns into soap.
  • Considered rare

Characteristics of Adipocere

9

Any substance altering the velocity of a chemical change.

  • As one of these, enzymes accelerate or speed up the chemical changes associated with decomposition. These enzymes secreted by the tissue cells are called autolytic enzymes.

Catalyst

10

  • Cupping of the eyeball 
  • Greenish discoloration over the abdominal area.
  • Postmortem stain
  • Dehydrated lips and eyelids

1-3 Days

of Putrefaction at 70oF in air

11

  • Purge
  • Green discoloration spreading over whole body
  • Visceral gas and some tissue gas
  • Odor

3-5 Days

Of Putrefaction at 70oF in air

12

  • Tissue gas present in all parts of the body
  • Massive skin slip
  • Body Swollen
  • Starting to turn dark

8-10 Days

Of Putrefaction at 70oF in air

13

  • Bubbles and blisters over the body
  • Mottled red, green and brown
  • Intense odor of putrefaction
  • Nails and hair loose
  • Eyes and tongue bulging
  • Recognition of features difficult

14-20 Days

Of Putrefaction at 70oF in air

14

  • Thoracic and abdominal cavities may burst open 
  • Body liquification and gases escaping.
  • Feature recognition is impossible
  • Bones separating from joints.

1 to 6 Months

Of Putrefaction at 70oF in air

15

The perfentage of hydrogen ions in concentration, pH may be defined as the degree of acidity or alkalinity of a substance. Simply, pH is a measure of the strength of an acid or base.

  • pH scale ranges from 0-14
  • 0 is most acid
  • 15 is most alkaline or base

pH

16

The normal pH of blood is 7.4 (7.35-7.45)

During Life

17

The pH may be as low as 5 to 6.

  • 6.3-6.6, slightly acidic, is usually the norm with an average of 6.5
  • The acidic tissues do not coagulate well with formalin solutions resulting in a rubber like texture rather than the firmness associated with formaldehyde.

During the maximum stage of rigor mortis

18

The tissues will return to an alkaline pH and between 7.5-8.5 with 8.0 as a norm, putrefaction will occur.

During advanced decomposition, the pH returns to an alkaline register

19

Most of these have a slightly alkaline pH. A group of chemicals called buffers are used to control embalming fluid pH and tissue pH.

Embalming Fluids

20

As the body contains much more protein than carbohydrates, the ammonia by-products resulting from a gradual build up in the tissues of nitrogen products will cause an increase in this.

Formaldehyde Demand

21

A postmortem stiffening of the body muscles, both voluntary and involuntary, by natural body processes. The stiffening will disappear naturally in a variable period of time as a result of natural body processes. Thus, this is a temporary stiffness of the dead muscle tissue as a result of the coagulation of the muscle juices.

Rigor mortis (Caderveric Rigidity)

22

The coagulating agent causing rigor mortis is said to be this.

Sarcolactic acid

23

Glycogen -> Pyruvic Acid = Sarcolactic Acid

Formula for Rigor Mortis

24

A carbohydrate stored in the muscles and living during life.

Glycogen

25

In death, an absence of oxygen will cause glycogen to form and release this. This will then break down to form sarcolactic acid.

Pyruvic Acid

26

Will combine with muscle juices or extracts such as myosinogen and/or paramyosinogen which will cause the formation of insoluble myosin or myosinfibrin resulting in rigor mortis.

Sarcolactic Acid

27

  • It coagulates the soluble muscle juices to form insoluble myosin.
  • It causes a swelling of the muscle cell colloid which may be so great as to destroy the structure of muscle cells.

This combination of coagulation and swelling produces the stiffness of the muscles seen in rigor mortis.

The Two Actions Sarcolactic Acid Takes on Muscle Tissues

28

  • Temperature
  • Age
  • Gender
  • Cause and Manner of Death
  • Condition of the Muscles

Conditions affecting the onset, duration and termination of Rigor Mortis

29

  • The amount of clothing and moisture will either increase or retard the onset of rigor mortis.
  • The extent of physical activity before death will affect the production of sarcolactic acid.
  • Rigor mortis is accelerated by heat and retarded by the cold.
  • Febrile disease will cause an early onset of postmortem caloricity which will hasten the onset of rigor mortis.

Temperature (Rigor Mortis)

30

A feeble and transitory rigidity that is rapid in onset and rapid in retreat is characteristic of infants and the aged.

  • The opposite is true in healthy, young adults- slower onset, longer duration, slower retreat.

Age (Rigor Mortis)

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