How are fingerprint ridges formed in the integumentary system?

Fingerprint ridges are formed during fetal development as the skin grows and the underlying dermal papillae interact with the epidermis. The patterns are influenced by genetic factors, environmental conditions, and mechanical pressures. These ridges develop into unique patterns, such as loops, whorls, and arches, which are established by around the 24th week of gestation and remain consistent throughout an individual’s life. The complexity and uniqueness of these patterns make fingerprints useful for identification.