Finger prints Important Terms - PowerPoint PPT Presentation

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Finger prints Important Terms

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  1. Finger prints Important Terms • Patent fingerprint • Plastic fingerprint • Latent fingerprint • Epidermal • Basal layer • Dermis • Basic (major) patterns • Arch • Loop • Whorl • Delta • Core • Minutia patterns

  2. 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? Delta

  3. Whorl • Whorls have at least two deltas and a core. • Four Groups • Plain • Central Pocket • Double Loop • Accidental Plain Whorl

  4. Arch • 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

  5. Fingerprint Minutiae Kendall/Hunt Publishing Company

  6. Ridge Characteristics Minutiae—characteristics of ridge patterns • Ridge ending • Short ridge • Dot or fragment • Bifurcation • Double bifurcation • Trifurcation • Bridge • Island • Enclosure • Spur