FSC239Y5 Lecture Notes - Lecture 6: Fetus, Eccrine Sweat Gland, Loop Jump
Document Summary
Fingers, palms, and soles have friction ridge skin. The pattern includes ridges (hills) and furrows (valleys). Ridged skin helps improve grip and prevent slippage. The pattern is determined by the dermal papillae, which is developed in the womb and remains unchanged throughout life (with the exception of deep scarring). Each ridge has a single row of pores, which are openings for sweat gland ducts. These release sweat onto the surface of the skin. *touch surface sweat and oils left on surface reproduction of ridges (to be developed via powder or chemicals). Friction ridges develop on the fetus before birth. Friction ridges are persistent throughout life except for permanent scarring. Variability of friction ridge patterns within limits allows for classification. Friction ridge patterns and details of ridges are unique and never repeated. Basic fingerprint patterns (1st level of detail): arches, loops (ulnar/pinky side or radial/thumb side), and whorls.
