Loop Ridge Counting
Table of Contents:
Ridge counting defined: The number of ridges intervening between the delta and the core (Figure 3.19).
Procedure for ridge counting: An imaginary line is placed between the core and the delta. Each ridge that crosses or touches the line is counted.
a. Counted (Figure 3.31)
b. Not counted (Figure 3.32)
Radial and Ulnar Loops
1. The terms have been derived from the radial and ulnar bones of the forearm.
a. Loops flowing in the direction of the little finger are ulnar loops.
b. Loops flowing in the direction of the thumb are radial loops.
i. Fingerprint cards: (manual/live scan)
ii. Right hand: Position as on the hand
iii. Left hand: The reverse
c. For purposes of automated use, loops are termed either right slanted (those patterns where ridges flow to the right) or left slanted (those patterns where ridges flow to the left).
2. Determining the direction of flow:
a. Begin at the core and follow or trace the ridges away from the delta.
b. From the recurve to the open end of loop.
Other Issues Pertaining to Loops
Figure 3.33 Loop ridge counts.