FSC360H5 Lecture : Lecture #5
Document Summary
Friction ridges: raised portion of epidermis on volar surfaces, sometimes known as. Epidermal ridges caused by interface between dermal papillae of dermis and interpapillary (rete) pegs of the epidermis: gestation (friction ridges develop between weeks 10 24) Pattern is inherited via several (7-8) genes > class. Fine details largely environmental determined > identifying: regenerate normally unless there is permanent destruction from deep wounds. Fingerprint examination (dactyloscopy: compares between known and unknown prints with threshold scoring. Individualization from expert examination, often using a computer database. Fingerprint minutiae: minutiae are the fine details used to compare fingerprints with great accuracy. Delta (ridge meets in a triangle: most us courts accept 6-8 point of similarity to accept fingerprints as matching. Fingerprint secretions: sweat (watery & some inorganic ions (na, k, bicarbonate), other bodily secretions contain lipids. Leads to latent, invisible fingerprints: dust/dirt/etc can get on fingers.
