Podcast
Questions and Answers
What is the primary reason for the uniqueness of fingerprint patterns?
What is the primary reason for the uniqueness of fingerprint patterns?
- The principle of physical uniqueness inherent in fingerprint patterns (correct)
- The corrugated formations on the underside of the hands and feet
- The eccrine glands on the skin
- The formation of friction ridges at 12-16 weeks’ gestation
Which term is used to describe the patterned ridges found on the skin?
Which term is used to describe the patterned ridges found on the skin?
- Sulci ridges
- Epidermal ridges (correct)
- Rugae ridges
- Eccrine ridges
At what stage of the human embryo do volar formations begin to appear?
At what stage of the human embryo do volar formations begin to appear?
- 12 weeks’ gestation
- 7 weeks’ gestation (correct)
- 9 weeks’ gestation
- 3 weeks’ gestation
What is the primary function of the eccrine glands in relation to friction skin?
What is the primary function of the eccrine glands in relation to friction skin?
Which part of the human body has locally parallel friction ridges separated by furrows (sulci)?
Which part of the human body has locally parallel friction ridges separated by furrows (sulci)?
What is the composition of the outmost layer of skin on human fingers, palms, toes, and soles?
What is the composition of the outmost layer of skin on human fingers, palms, toes, and soles?
Which type of loop pattern has an angle to the left?
Which type of loop pattern has an angle to the left?
What type of whorl pattern has two deltas and one core?
What type of whorl pattern has two deltas and one core?
In which type of arch pattern do ridges flow in from one side and flow out the opposite side without any deltas or core?
In which type of arch pattern do ridges flow in from one side and flow out the opposite side without any deltas or core?
What can naturally desiccated bodies lead to if the moisture content of tissues is below the level required for bacterial putrefaction?
What can naturally desiccated bodies lead to if the moisture content of tissues is below the level required for bacterial putrefaction?
Which method of fingerprint alteration temporarily flattens the friction ridges?
Which method of fingerprint alteration temporarily flattens the friction ridges?
What term is used to describe the inherited absence of epidermal ridges on the fingers or toes?
What term is used to describe the inherited absence of epidermal ridges on the fingers or toes?
Which factor affects the lifespan of a fingerprint deposit?
Which factor affects the lifespan of a fingerprint deposit?
What type of fingerprint pattern has ridges that flow upwards rather than forming whorls or loops?
What type of fingerprint pattern has ridges that flow upwards rather than forming whorls or loops?
Which type of fingerprint is made in perspiration and is not readily visible until developed?
Which type of fingerprint is made in perspiration and is not readily visible until developed?
What is the primary purpose of the Automated Fingerprint Identification Systems (AFIS) service in the USA?
What is the primary purpose of the Automated Fingerprint Identification Systems (AFIS) service in the USA?
In the context of friction ridge analysis, what does the term 'ACE-V' stand for?
In the context of friction ridge analysis, what does the term 'ACE-V' stand for?
What is the main characteristic of friction ridges found on the palmar and plantar surfaces?
What is the main characteristic of friction ridges found on the palmar and plantar surfaces?
Which system utilizes the SAGEM morpho operating system for the storage, search, and retrieval of finger and palm print electronic images?
Which system utilizes the SAGEM morpho operating system for the storage, search, and retrieval of finger and palm print electronic images?
What is the primary effect of iodine fuming in developing latent prints?
What is the primary effect of iodine fuming in developing latent prints?
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Study Notes
Fingerprint Patterns and Characteristics
- The uniqueness of fingerprint patterns is due to the random formation of volar pads during fetal development.
Fingerprint Anatomy
- Patterned ridges found on the skin are referred to as friction ridges.
- Friction ridges are separated by furrows, also known as sulci.
Fetal Development
- Volar formations begin to appear during the 12th week of fetal development.
Skin Composition
- The outermost layer of skin on human fingers, palms, toes, and soles is composed of keratinized skin.
Friction Ridges and Glands
- Eccrine glands produce sweat that helps to keep friction ridges moisturized, reducing friction.
Fingerprint Patterns
- A ulnar loop pattern has an angle to the left.
- A double whorl pattern has two deltas and one core.
- A plain arch pattern has ridges that flow in from one side and out the opposite side without deltas or core.
Forensic Science
- Naturally desiccated bodies can lead to mummification if the moisture content of tissues is below the level required for bacterial putrefaction.
- Sanding is a method of fingerprint alteration that temporarily flattens the friction ridges.
Genetic Disorders
- Adermatoglyphia is the inherited absence of epidermal ridges on the fingers or toes.
Fingerprint Deposition
- The lifespan of a fingerprint deposit is affected by factors such as temperature and humidity.
Fingerprint Patterns (continued)
- A radial loop pattern has ridges that flow upwards rather than forming whorls or loops.
- Latent prints are made in perspiration and are not readily visible until developed.
Forensic Databases
- The primary purpose of the Automated Fingerprint Identification Systems (AFIS) service in the USA is to store, search, and retrieve fingerprints.
Friction Ridge Analysis
- ACE-V stands for Analysis, Comparison, Evaluation, and Verification.
- Friction ridges found on the palmar and plantar surfaces are characterized by being locally parallel.
Biometric Systems
- The MORPHO system utilizes the SAGEM morpho operating system for the storage, search, and retrieval of finger and palm print electronic images.
Fingerprint Development
- Iodine fuming develops latent prints by causing the latent print residue to react with the iodine crystals, making it visible.
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