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NCJRS Abstract

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NCJ Number: 225323 
Title: Fingerprint Sourcebook-Chapter 3: Embryology, Physiology, and Morphology of Friction Ridge Skin
Author(s): Kasey Wertheim
Date Published: 2011
Page Count: 26
Sponsoring Agency: National Institute of Justice (NIJ)
Washington, DC 20531
National Institute of Justice/NCJRS
Rockville, MD 20849
NCJRS Photocopy Services
Rockville, MD 20849-6000
Sale Source: National Institute of Justice/NCJRS
Box 6000
Rockville, MD 20849
United States of America

NCJRS Photocopy Services
Box 6000
Rockville, MD 20849-6000
United States of America
Document: PDF
Type: Instructional Material; Issue Overview
Format: Book Chapter
Language: English
Country: United States of America
Annotation: This chapter integrates references that address small facets of the underlying biology of friction ridge skin, so that latent fingerprint examiners can use this chapter as a single reference for understanding why friction ridge skin is unique and persistent for each individual.
Abstract: The basis for persistence in friction ridge skin is found in morphology and physiology, which have determined that the epidermis faithfully reproduces the three-dimensional ridges due to physical attachments and constant regulation of cell proliferation and differentiation. On the other hand, embryology explains why friction ridge skin is unique for each individual. This is the focus of the chapter. The unique features of the skin are established between approximately 10 ½ and 16 weeks estimated gestational age (EGA) due to developmental patterns. During growth, signal substances are partitioned into different daughter cells, endowing them with distinct developmental instruction. The embryo is pre-patterned to continue developing with unique cell orientation. The chapter explains late embryological development (3-8 weeks EGA); fetal growth (9-12 weeks EGA); second trimester; and third trimester. This is followed by a section on limb development, with attention to the hands and friction ridge development. The differentiation of the friction ridge skin is explained in detail, including primary ridge formation and the propagation of secondary ridge formation. This is followed by an explanation of pattern formation. A section on genetics addresses genetic diversity and friction ridge skin, with attention to relevant familial studies. Causes of the uniqueness of friction ridge skin for each individual are summarized under the concept of “developmental noise," which pertains to the myriad of random forces that are themselves influenced by a seemingly infinite number of factors. Extensive figures and approximately 80 references
Main Term(s): Criminology
Index Term(s): Biological influences; Fingerprints; Forensic science training; Forensic sciences; Latent fingerprints; Suspect identification
Note: See NCJ 225320 for the complete Fingerprint Sourcebook.
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