Fingerprint Analysis - West Linn-Wilsonville School District

Fingerprint Patterns and Ridge Counts Unit Two Forensic Science Notes 2.2 Three Patterns (Classes) of Fingerprints (Eight Types)

1. Arch Patterns x2 Plain arch Tented arch 2. Whorl Patterns x4 Plain whorls Central pocket loops

Double loops *Accidentals 1. Loop Patterns x2 Radial Ulnar (called a left or right loop if the hand

from which it came is unknown) The Archs The Plain Arch Formed by ridges entering from one

side of the print and exiting on the opposite side. These ridges rise at the center, forming a wavelike structure. The Plain Arch - count

Connect the delta to the center Ridge Count = 0 (the delta is the center) The Tented Arch Similar to the arch, but there is either a

sharp spike, or the ridges meet at an angle that is less than 90 degrees. The center often resembles a tent pole.

The Tented Arch - count Connect the delta to the center Ridge Count = 0 (the delta is the center) The Loops

A loop must have one or more ridges entering from one side of the print, curving, and returning to the same side. If a loop opens

toward the little finger, it is called an ULNAR LOOP. If it opens toward the thumb, it is a RADIAL LOOP. The Loop Ridge count

Connect the delta to the center core and count the number of ridges cross the line Whorl Patterns The Double Loop (A Whorl)

The DOUBLE LOOP is made up of any two loops combined into one fingerprint The Double Loop ridge count Count the ridges that cross a line

drawn between the delta The Plain Whorl These have at least one ridge that makes a complete circuit. This ridge

may be in the form of a spiral, an oval, or any circular form. A line drawn between the delta will intersect a circle The Plain Whorl - count

Count the ridges crossing a line drawn between the delta. The Central Pocket Loop (whorl) The central pocket

loop pattern consists a whorl embedded in a loop formation. A line drawn between the deltae will not intersect a circle

The Central Pocket Loop Count the ridges that cross a line drawn between the deltae

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