1. 1 - What are Fingerprints?
July 1, 2019
Fingerprints

2. What are Fingerprints?
Fingers, toes, palms and feet have small ridges.
Ridges are connected units called dermal or friction ridges.
Friction ridges help people to pick up things
July 1, 2019
Fingerprints

3. Fingerprints Skin secretes sweat
Oils, water and salts
When a person touches a smooth surface, a mark is left.
July 1, 2019
Fingerprints

4. Our fingertips are covered with hundreds of microscopic sweat pores wihich make out fingers moist and able to grip things.
Melanocytes contain pigmentation and give the skin color. Sebaceous glands secrete a waxy material that moistens skin and waterproofs skin. The Pancinian corpuscle is a sensory organ that responds to vibration and asists in grasping.
July 1, 2019
Fingerprints

5. Formation of Fingerprints
Friction ridges are established by the 10th week of pregnancy.
The ridges occur in the sub-layer of the epidermis and are protected.
Fingerprints cannot be destroyed.
July 1, 2019
Fingerprints

6. Formation of Fingerprints
The basal layer of skin in a fetus' finger grows faster than the epidermis and dermis. The underlying structure is like the springs of a bed.
July 1, 2019
Fingerprints

7. Fingerprint Removal Four different methods of fingerprint removal:
burning off with caustic substance
biting off the fingertips
transplanted skin from feet
surgical removal of fingertip skin
July 1, 2019
Fingerprints

8. Biting Off The Fingertips
Finger tips have been chewed off.
When the skin heals, the fingerprint returns.
July 1, 2019
Fingerprints

9. Burning with Caustic Substance
People have tried to remove fingerprints with acid.
Fingerprints grow back.
July 1, 2019
Fingerprints

10. Transplanted Skin from Feet
A recent trend is to achieve this surgically, either via skin grafts from the feet or the skin.
Others have layers of skin surgically removed from the fingertips
Picture of a man who’s toe skin was use to replace is fingertips. Doctor who performed the operation was sentence to prison
July 1, 2019
Fingerprints

11. Skin Grafts Skin grafts can remove fingerprints.
This does not remove all prints from the body.
As a forensic scientist, look for more than fingerprints.
July 1, 2019
Fingerprints