- RADIAL LOOP FACT 6: Radial loops have a different distribution across the fingers in genetic disorders - In the general population radial loops typically show a uniform distribution featured with a sharp peak on the index finger. However, in genetic disorders the distribution is often very different.
Loops can be ulnar -- ridges flow toward the ulnar bone (or little finger) or radial -- ridges flow toward the radius bone. The number of ridges that appear between the delta and the core is the ridge count. The whorl pattern consists of two deltas with a recurve in front of each. There are four types of whorls.