BIOL 2443 Lecture Notes - Lecture 8: Stratum Corneum, Dermis, Stratum Basale
Document Summary
Structure of the skin largest organ of the body. It consists of two major layers: cutaneous membrane covers the external surface of the body and is the, weighs about 10 11 lb which is about 7% of body weight. Increase surface area of epidermis to increase friction pigments: melanin (biggest contributor), carotene, and hemoglobin. Skin color not dependent on number of melanocytes, but how much melanin produced by melanocytes epidermal ridges and dermal papillae. Increased number of tactile corpuscles to increase sensitivity: lines of cleavage, plastic surgeons, epidermal ridges, stronger bond between epidermis and dermis because of alternating. Jaundice yellow color due to build up of the yellow pigment bilirubin: liver disease, erythema redness color, exposure to heat, infection, inflammation, or allergic raction. Inadequate amount of oxygen from the lungs causing skin or nail beds to appear blue eyes, skin irregular white spots. Structural basis of skin color tan to black.
