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Unit 4: Fingerprints - PowerPoint PPT Presentation

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Unit 4: Fingerprints
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  1. Unit 4: Fingerprints 4.3 Classification of Fingerprints

  2. B. Classification of Fingerprints • Loop • Enter & leave the same way • Delta & core are present • Most common

  3. Loop • A loop must have one or more ridges entering and exiting from the same side. Loops must have one delta. • Types • Radial—opens toward the thumb • Ulnar—opens toward the “pinky” (little finger) • Which type of loop is this, if it is on the right hand? Left hand? Kendall/Hunt Publishing Company

  4. Loop Types • Left Slant Loop • Right Slant Loop

  5. Whorl • At least 2 deltas and one core • Four groups • Whorl • Central pocket • Double • Accidental

  6. Whorl • A plain or central pocket whorl has at least one ridge that makes a complete circuit. A double loop is made of two loops. An accidental is a pattern not covered by other categories. Whorls have at least two deltas and a core. Kendall/Hunt Publishing Company

  7. Plain Whorl Central Pocket Double Whorl Accidental Whorl Types

  8. Arches • In one side and out the other • Least common

  9. Arch An arch has friction ridges that enter on one side of the finger and cross to the other side while rising upward in the middle. They do NOT have type lines, deltas, or cores. Types • Plain • Tented Kendall/Hunt Publishing Company

  10. Plain Arch No delta or core Tented Arch Has a delta in the center. Arch Types