The types of fingerprint patterns are plain arch, tented arch, radial loop, ulnar loop, double loop, accidental whorl, plain whorl, and central pocket whorls. That’s a total of eight print types.
Loops occur in about 60-70 % of fingerprint patterns. The ridges run straight then loop back on themselves in at least one part of the print. Radial loops are named after the radius bone in the forearm that connects to the hand on the same side as the thumb; therefore, the pattern in radial loops runs in toward the thumb. Radial loops are not very common and most of the time they are found on index fingers. Ulnar loops are named after the ulna, bone in the forearm. The ulna is on the same side as the little finger so the flow of an ulnar loop pattern runs toward the little finger.
|Radial or Ulnar Loop (based on hand and finger)|
|Central Pocket Whorl|