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Definitions > Forensics > Flashcards

Forensics Flashcards

1
Q

superfetation

A

the occurrence of a second conception during pregnancy, giving rise to embryos of different ages in the uterus

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2
Q

Justinian Code (550 AD)

A
  • regulation of practice of medicine & surgery
  • proof of competence by means of examinations
  • limitations of numbers of physicians in towns
  • penalties for malpractice
  • status & function of the medical expert in legal proceedings
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3
Q

Grand challenges in forensic science & death investigation…

A
  1. Molecular photo-fitting…
  2. Chemical imaging, profiling and age estimation of finger marks…
  3. Advancing autopsy practice… minimally invasive techniques & probes
  4. Digital forensic imaging and service centres… “Big Data”
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4
Q

Locard’s Principle

A

When any two objects come into contact there is

always a transfer of material between them…

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5
Q

Forensic medicine

A

The branch of medicine dealing with the application of medical knowledge to establish facts in civil or criminal legal cases, such as an investigation into the cause and time of a suspicious death

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6
Q

Divisions of Forensic Medicine:

A
  • Medical law, medical malpractice & medical negligence
  • Clinical forensic medicine
  • Forensic pathology: Thanatology, Traumatology, Forensic science
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7
Q

sourcess of law

A

Codification of the Law
Court decisions
formal law
statutory law

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8
Q

court proceedings

A
  1. Statement (Sworn statement / Affidavit / Expert report)
  2. Witness order / subpoena
  3. Pre-Trial Conference
  4. “Viva voce” evidence / testimony
  5. Taking the Oath / Solemn Declaration
  6. “Examination-in-Chief”
  7. “Cross-examination”
  8. “Re-examination”
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9
Q

types of death

A

Somatic
Irreversibly loses innate personality, unconscious, unable to be aware of (or to communicate with) their environment, and unable to appreciate any sensory stimuli or to initiate any voluntary movement

Cellular
Tissues and their constituent cells are dead – no metabolic activity, aerobic respiration

Brain death
Somatic death with circulatory and respiratory spontaneous function

Brainstem death
Need ventilator support because critical centres dead

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10
Q

agonal period

A

during which the dying process occurs, and in homicide cases, is often the interval between the time of fatal injury and death

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11
Q

indications of death

A 
No pulse  - auscultation / ECG
Respiration cessation   
Eyes- Loss of corneal and light reflexes
-Fixed unreactive pupils – mid-dilated position, +/- difference in dilatation
-Retina – ‘trucking of blood’
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12
Q

PM Changes

A 
Rigor mortis
Hypostasis
Temperature
Supravital reactions
Autolysis
mummification
putrefication
adipocere
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13
Q

Putrefaction

A 
Entomology
Animal predation
Resuscitation
Embalming 
Undertakers fracture
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14
Q

lividity

A

refers to an unnatural color of the skin

Livor mortis starts in 20–30 minutes, but is usually not observable by the human eye until two hours after death

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15
Q

stages of death

A 
pallor mortis
algor mortis
rigor mortis
livor mortis
putrefaction
decomposition
skeletonization
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16
Q

putrefaction

A

the process of decay or rotting in a body or other organic matter caused by the uncontrolled growth of innate (gut commensals) and pathogenic micro-organisms

  • Initial decay (36 / 72 hrs – 1 week)
  • Black putrefaction ( up to 1 month)
  • Dry decay then skeletonization
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17
Q

Adipocere

A

a late-stage postmortem decomposition product consisting of a mixture of free fatty acids (FFAs) formed under favorable conditions due to the hydrolysis of triglycerides in adipose tissu
formation of adipocere - requires immersion in water, burial in moist environment

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18
Q

supravital reactions

A

False positive signs suggestive of life
12 – 15hrs post death

Mechanical excitability of muscle
Zsakos phenomenon – patella
Localised muscle bulge - biceps

Electrical excitability of muscles
Chemical stimulation of the iris

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19
Q

pm fluid loss Signs

A

Skin – dry
Corneas – clouded and dry – “tache noire”
Loss of eye-globe tension

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20
Q

Algor mortis

A

Body cools as metabolic activity ceases post death until it reaches that of the environment
8-12 hours skin

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21
Q

Henssge’s Nomogram

A

mathematic estimation of the PMI using body temperature, mass and utilises various corrective factors for naked and clothed bodies in still/moving air

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22
Q

Factors affecting hypostasis

A

Skin colour - less perceptible in dark skins
Quantity of blood in system - e.g. anaemia, haemorrhage
Length of time body lies in the same position
Absent on areas exposed to pressure

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23
Q

‘rule of thumb’ PMI estimate

A

Body feels warm and is flaccid (dead <3 hours)
Body feels warm and is stiff (dead 3-8 hours)
Body feels cold and is stiff (dead 8-36 hours)
Body feels cold and is flaccid (dead over 36 hours)

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24
Q

Nysten’s law

A

rigor mortis starts from Face – neck – trunk – upper limbs – lower limbs

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25
Q

factors affecting rigor mortis

A

Exercise
Age – develops and disappears faster in children than adults
Emaciated
Temperature – the higher the temp, the faster the development of rigor

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26
Q

Cadaveric spasm

A

rare form of muscular stiffening that occurs at the moment of death and persists into the period of rigor mortis

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27
Q

Casper’s Rule

A

“When there’s free access to air, a body decomposes twice as fast than if immersed in water and 8 times faster than if buried in earth”

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28
Q

mummification

A

Dry conditions - desiccation instead of putrefying
Dry and leathery and often brown in colour
Commonly occurs in warm and hot climates, such as in the desert, but if the micro-environment is dry enough, it can occur anywhere
Mummification of finger tips and noses etc. can often be seen in adult bodies at the same time as liquefactive decomposition
Insects (especially moths and beetles) can degrade mummified remains

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29
Q

entymology

A

Necrophagous species - Invertebrates that feed on the corpse itself
Predators and parasites of necrophagous species - do not feed directly on the corpse
Omnivorous species - Feed on everything
Adventive or opportunistic species - Insects that use corpse as shelter, nest

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30
Q

post mortem artefacts

A

Animal predation
Post mortem gas bubbling
Right ventricle – not air embolus
Leptomeningeal vessels - not cerebral air embolus
Post mortem blood clots
Artefacts caused by preparation of the body
Undertakers fracture
Embalming - injection sites , change in body colour

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31
Q

death scene

A

an entity which is created when the police enclose an area of interest in relation to an actual or suspected offence

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32
Q

Diatoms

A

algae, microscopic unicellular plants that can be found in saltwater, freshwater, soils and on damp surfaces. In a case of “common drowning”, water, containing diatoms, enters the lungs and then passes into the bloodstream where the diatoms are circulated around the body to all body organs

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33
Q

Forensic palynology

A

the study of pollen, spores and other acid-resistant microscopic plant bodies, including dinoflagellates, to prove or disprove a relationship among objects, people and places that pertain to both criminal and civil cases

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34
Q

Forensic engineering

A

the application of engineering principles to the investigation of failures or other performance problems of machines, structure, component or material

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35
Q

Anthropology

A

the study of the biological and cultural aspects of humans

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36
Q

Palynomorphs

A

Insect and plant remains, particularly micro-charcoal

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37
Q

Postmortem redistribution (PMR)

A

refers to the changes that occur in drug concentrations after death. It involves the redistribution of drugs into blood from solid organs such as the lungs, liver, and myocardium.

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38
Q

ballistics

A

Internal Ballistics
Looks at the striations and other marks made to a projectile as it passes through the barrel of a firearm, called rifling
External Ballistics
The study of flight and angle of shot patterns
Terminal Ballistics
The study of the effect of the projectile on or in the target. Wound analysis

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39
Q

Pyrolysis

A

the thermal degradation of biomass by heat in the absence of oxygen and results in the production of charcoal (solid), bio-oil (liquid), and fuel gases.

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40
Q

most common cause of myocardial rupture

A 
recent myocardial infarction
cardiac trauma
endocarditis
cardiac tumors
aortic dissection
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41
Q

hypoxia classification

A 
Histotoxic hypoxia 
Diminished capability to utilize oxygen 
Anaemic hypoxia  
Decreased oxygen carrying capacity 
Stagnant hypoxia  
Collapse or reduction of blood circulation 
Hypoxic hypoxia
Diminished oxygen intake
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42
Q

mechanical asphyxia

A

Suffocation (cutting off the air supply)- Vitiated atmosphere, External airway
Internal airway- Choking (aspiration), Airway swelling or obstruction, airway compression
Neck compression (vascular/airway compression)- Hanging, Strangulation
Chest compression- Compression (traumatic) asphyxia, Postural (positional) asphyxia, Miscellaneous

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43
Q

classic sx of asphyxia

A

Petechial haemorrhages
Congestion and oedema
Cyanosis
Engorgement of the right heart and fluidity of the blood…

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44
Q

smothering and gagging

A

Smothering – indicates blockage of the external air passages, usually by a hand or soft fabric
Gagging - fabric or adhesive tape occludes the mouth to prevent speaking or shouting

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45
Q

‘Café coronary’

A

sudden and unexpected death occurring during a meal due to accidental occlusion of the airway by food

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46
Q

mechanisms of death for hanging

A

Airway obstruction- oxygen deprivation (hypoxic hypoxia) with carbon dioxide accumulation
Reduced arterial blood flow to brain (anaemic hypoxia)
Reduced venous return of the brain (stagnant hypoxia)
Vagal inhibition (neurogenic cardiac arrest)
Cervical spinal cord injury

47
Q

Blood-field neck dissection

A

Layer by layer strip dissection of the anterior neck muscles, cartilage and bone
Specialised technique that is necessary to do in order to prevent misinterpretation of artefactual haemorrhages in the neck

48
Q

hydrocutions

A

Death is attributed to cardiac arrest due to vagal inhibition, which results from stimulation of vagal nerve endings
the young swimmers and alcohol, high state of emotions or excitement or overeating prior to swimming may be the predisposing factor
The situation where blood vessels dilated by the heat contract suddenly, when cold water is applied to the skin, leading to cardiac arrest

49
Q

Cold shock response

A

a series of cardio-respiratory responses caused by the sudden immersion of cold water

50
Q

s/s of drowing

A

Wrinkled feet and hands
Cutis anserina- goose bumps, a temporary local change in the skin when it becomes rougher due to erection of little muscles

51
Q

drowining categories

A

Drowning with recovery – casualty rescued from water and recovers with resuscitation
Secondary drowning – Casualty rescued from water but dies between 30minutes and several days later
Primary drowning – Casualty fell into water or other fluid and consequently died immediately or within minutes
Pseudo-or apparent drowning – Casualty was already dead when immersion took place

52
Q

dry drowning

A

It is thought that the volume of liquid inhaled causes protracted laryngospasm resulting in a vaso-vagal mediated cardiac arrest

53
Q

Specimens from the genital area
must be collected in the following
sequence

A 
extemal anal area
external genitalia , especially the fold
between the labia majora and labia minora
vagina, especially the posterior fornix
extemal os of the cervix
54
Q

statutes

A

Inquests Act 1959
Non-natural deaths
Registration of Births and Deaths Act 1992
Natural deaths & death certification
National Health Act 2003
Rendering of a death investigation service (FPS)
Ch 8: Autopsies & use of human tissue
Regulations on Forensic Pathology Services: Defn of Unnatural Death
Health Professions Act 1974
Deaths associated with medical treatment

55
Q

statute

A

a written law passed by a legislative body

56
Q

Undertaker’s fracture

A

artifact related to poor handling of the corpse characterized by subluxation of the lower cervical spine from tearing of the intervertebral disc at C6-C7 vertebral level. It occurs due to sudden fall of the head over occipital region.

57
Q

non natural deaths

A

Physical or chemical influence
Action or omission amounting to negligence
Procedure related & anaesthetic death
Sudden / unexpected / unattended death

58
Q

Health Professions Act 1974, Section 56

A

“The death of a person undergoing, or as a result of,
a procedure of a therapeutic, diagnostic or palliative nature
or of which any aspect of such a procedure has been a contributory cause,
shall not be deemed to be a death from natural causes

59
Q

Traumatic and positional asphyxiation

A

Traumatic asphyxiation
external pressure to the chest resulting in asphyxiation
transportation injuries, collapsed buildings or mines
Positional asphyxiation
restriction of chest movement due to external pressure resulting from positioning

60
Q

commotio cordis

A

ethal disruption of heart rhythm that occurs as a result of a blow to the area directly over the heart (the precordial region) at a critical time during the cycle of a heart beat
increased risk during: sports

61
Q

pulmonary barotrauma / “blast lung” shows

A 
haemorrhage
oedema
laceration
contusions
ALI (acute lung injury)
ARDS (acute respiratory distress injury)
62
Q

classification of Blast Overpressure (BOP) injuries: primary, secondary, tertiary and quaternary

A

Primary injuries are caused by the effect of transmitted blast waves on gas-containing structures
secondary injuries, by the impact of airborne debris
tertiary injury, by the transposition of the entire body because of blast wind or structural collapse
quaternary injuries, by all other forces

63
Q

Primary medical cause of death or COD

A

The initial disease or injury that first set in and which eventually resulted in the demise of the person, even though it may have caused the person one or more intervening medical complications
Stab wound to the chest, ruptured appendix

64
Q

Mechanism of death

A

The (patho-)physiological disturbance which ultimately results in death of a person and which follows on or arises secondary to the pMCOD

65
Q

whipple procedure (pancreaticoduodenectomy

A

an operation to remove the head of the pancreas, the first part of the small intestine (duodenum), the gallbladder and the bile duc

66
Q

ancillary investigations eg

A 
Histology 
Molecular pathology – including DNA analysis
Toxicology 
Ballistics
Trace evidence analysis
67
Q

contrecoup injury

A

occurs on the opposite side of the brain from where the impact occurred

68
Q

Puppe’s Rule

A

if multiple gunshot or blunt force trauma wounds are present it is possible to establish the sequence of shots/hits. A fracture will stop when it hits another fracture

69
Q

Duret haemorrhages

A

small linear areas of bleeding in the midbrain and upper pons of the brainstem. They are caused by a traumatic downward displacement of the brainstem

70
Q

Diffuse axonal injury

A

Damage to axons of any aetiology which traumatic axonal injury (TAI) is but one of the examples. It is primarily a non-impact rotational acceleration-deceleration phenomenon, deformation by stretching probably being the most significant factor
most common pathological feature noted in TBI

71
Q

Traumatic axonal injury (TAI)

A

damage to axons caused by trauma, which may vary from small foci of axons to more widespread brain damage

72
Q

Sequela of brain injury

A 
Cerebral swelling
Raised intracranial pressure
Hypoxic / ischaemic brain damage
Infections
Neurological sequelae
Enlargement of the primary haemorrhage
Traumatic aneurysm
73
Q

Triticeous cartilage

A

a small ovoid structure belonging to the laryngeal skeleton. When calcified, it becomes visible on panoramic radiographs and be mistaken for a carotid artery calcification (CAC) associated with cerebrovascular accidents

74
Q

Prinsloo and Gordon Haemorrhages

A

artefactual extravasation of blood into the anterior neck structures at autopsy, resembling traumatic bruises, and recommended a layered in-situ approach to the neck dissectio

75
Q

Post mortem hypostatic haemorrhages (Tardieu spots)

A

intense lividity can be associated with small hemorrhages in the skin

76
Q

Resuscitation related neck injuries

A
  • CVP / IV insertion - SCM haemorrhage
  • ETT – laryngeal mucosal haemorrhage and oedema
  • Application of cricoid pressure
77
Q

Erotic asphyxiation/ Sexual asphyxia

A

This type of sexual activity involves intentionally cutting off the air supply for you or your partner with choking, suffocating, and other acts

78
Q

restraint asphyxia

A

when a person is restrained and left alone prone, such as in a police vehicle, and is unable to reposition himself or herself in order to breathe

79
Q

Carotid sleeper

A

direction of force on neck aimed at compressing carotid aa

80
Q

bar hold

A

force applied across front of neck compressing the irway

81
Q

lightning-induced injuries- light component

A

uveitis, cystic macular oedema, macular
holes, Bilateral iridocyclitis, cataract with
posterior subcapsular damage

82
Q

lightning-induced injuries - heat component

A

First-degree burns may follow the skin
creases. These marks may be centimetres
long and generally follow the long axis of the
body towards the ground.
smell of singeing or burning about the body
and clothing. The hair may be scorched or
singed.

83
Q

lightning-induced injuries - electrical component

A

Lightning injury may cause abrupt cerebral
salt-wasting syndrome. Lightning injury may
even cause delayed-onset psychiatric and
cognitive symptoms.

84
Q

lightning-induced injuries - barotrauma component

A

The primary targets for blast overpressure damage are the hollow organs, ear, lungs and GIT.
Free- radical-mediated oxidative stress may occur
and contribute to blast overpressure injury.
lighntning induced pneumo mediastinum

85
Q

lightning strikes Rx

A

As a treatment, use fluid therapy and/or analgesia and anti-oxidants.
Focus on cardiovascular therapy, central nervous
system therapy, burn wound therapy, eye
therapy and ear therapy, and consult specialists
in these fields where necessary.

86
Q

lightning strikes complications

A

haematological abnormalities
endocrine and sexual dysfunction.
psychological and neurocognitive dysfunction (memory disturbances, concentration
disturbances, cognitive dysfunction and problems with higher executive functioning

87
Q

Injury mechanisms

A 
ground curent
side flash
upward stream
direct strike
contact with obbject
88
Q

Hide and die syndrome

A

occurs in the final stages of hypothermia. The afflicted will enter small, enclosed spaces, such as underneath beds or behind wardrobes. It is often associated with paradoxical undressing

89
Q

High altitude illness

A

the current accepted clinical term for a group of disorders including acute mountain
sickness (AMS), high-altitude cerebral edema (HACE), and high-altitude pulmonary edema (HAPE), which occur in travellers visiting high-altitude locations

90
Q

law

A

a body of rules, governing human behaviour, prescribed by the society, applied by the courts and enforced by the executive”

91
Q

medical law

A

refers to that body of rules of law relating to (a) the medical profession; (b) the relationship
between doctor or hospital on the one hand and patient on the other; (c) the relationship between the medical profession and other health care workers;
(d) the doctor and health care legislation

92
Q

Causes of Trauma

physical

A 
Mechanical  
Thermal  
Electrical               
Barotrauma  
Ionizing radiation  
Ultrasound
93
Q

chemical cause of trauma

A 
External contact 
Ingestion  
Inhalation  
Intravascular  
Rectal
94
Q

Hypoxia / Anoxia

A

Histotoxic
Anaemic
Stagnant
Anoxic

95
Q

Long QT syndrome (LQTS)

A

condition in which repolarization of the heart after a heartbeat is affected. It results in an increased risk of an irregular heartbeat which can result in fainting, drowning, seizures, or sudden death. These episodes can be triggered by exercise or stress

96
Q

res ipsa loquitu

A

the principle that the mere occurrence of some types of accident is sufficient to imply negligence

97
Q

Fimbriated hymens

A

characterized by redundant folds of hymenal tissue with scalloped rims that circumscribe the vaginal introitus

98
Q

Monro-Kellie doctrine or hypothesis

A

the sum of volumes of brain, cerebrospinal fluid (CSF) and intracerebral blood is constant. An increase in one should cause a reciprocal decrease in either one or both of the remaining two

99
Q

Types of Atelectasis

A 
Resorptive Atelectasis
Relaxation Atelectasis
Adhesive Atelectasis
Cicatricial Atelectasis
Round Atelectasis.
100
Q

skull fracture types

A 
Depressed frcaturs
 Depressed vault fractures
2. Linear fractures
 Hair line - vault
 Basilar- skull base
 Diastatic (along suture)-> comminuted (multiple pieces) or hing door (one piece and
simple)
3. Hinge fractures
4. Rung frcatures
5. “spiders web’ fecatures
6. “blow out’ frcatures
101
Q

Tardieu spots

A

purple to black spots on the skin that can develop along with lividity, from the rupture of capillaries

102
Q

Injuries seen in an MVA

A 
Skull and facial fractures
Brain and its coverings injured
Cervical spine injuries
Rib/ Sternal
Heart
Liver injures
103
Q

Typical injury in PVA

A
  1. Beta rupture of the aorta
  2. Hypeflexion and hyperextions of the spine
  3. Traumatic axonal inury
  4. Cord damage
  5. SAH
  6. Blood in fourth ventricle
104
Q

If a run over injury occurs

A 
 Disrupted skull
 Externalised brian
 Internal organs ruptured
 Pine fractures
 Chest compression- flail chest
105
Q

How to assess if baby lived outside mom

A
  1. ‘flotation tst’ (hydrostatic test)
    - If lung/piece of lung sinks in water, baby had not breathed suffieicnely to expand lung or mau
    have been still born
  2. Milk in stomach
  3. Stomach flotation test
  4. Umbilical cord remnant shrivelled/ shows inflammation of impending speeration
  5. Umbilical cord skin junction look for vital raction on microscopy
106
Q

locus standi

A

the right or capacity to bring an action or to appear in a court

107
Q

Saponification

A

process by which triglycerides are reacted with sodium or potassium hydroxide (lye) to produce glycerol and a fatty acid salt called “soap.”

108
Q

Medical criminalistics

A

It includes the clinical examination of surviving victims and suspects, the inspection of the scene in suspicious deaths with subsequent performance of medico-legal autopsies, the assessment of (biological) traces and the reconstruction of criminal events under medical aspects

109
Q

Pontomedullary rent

A

a primary injury to the brainstem that may occur in high-speed accidents

110
Q

eg of necrophagus spp of insects

A

Calliphora vicina, Phormia regina, Protophormia terraenovae

111
Q

predators and parasites of necrophagus spp

A

Silphidae (carrion beetles) and Staphylinidae (rove beetles)

Hymenoptera

112
Q

omnivorous insects

A

ants, wasps, and some species of carrion beetles

113
Q

opportunistic insects

A

springtails, centipedes and spiders.

114
Q

Channelopathies

A

diseases caused by disturbed function of ion channel subunits or the proteins that regulate them. These diseases may be either congenital (often resulting from a mutation or mutations in the encoding genes) or acquired (often resulting from autoimmune attack on an ion channel)

Definitions (11 decks)

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