In Galton–Henry fingerprint classification, a pattern showing a loop entering and exiting from the radial (thumb) side of the finger is called a:

• A Ulnar loop — most common pattern in the general population
• B Whorl — two deltas present, central oval pattern
• C Radial loop — opens towards the thumb (radial) side ✓
• D Arch — no delta, ridge flow straight across finger

Explanation

In loop patterns, the name indicates the side from which the loop opens and exits. A radial loop opens towards the radius (thumb side) and is less common (~5%); an ulnar loop opens towards the ulna (little finger side) and is the most common fingerprint pattern (~65%). Arches have no delta and no triradius; whorls have two deltas. The Henry classification uses finger-by-finger loop type and ridge count for forensic filing.

Reference: The Essentials of Forensic Medicine and Toxicology (Narayan Reddy), 34th ed.

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Written and medically reviewed by the StethoPrep medical team.