BIOB34H3 Chapter Notes - Chapter 5: Stratum Granulosum, Stratum Lucidum, Stratum Spinosum
Document Summary
Thickness ranges from . 1 mm 2 mm. Connective tissue with other embedded structures: cells include fibroblasts, macrophages, contains blood vessels and nerves, glands and hair follicles are embedded. Attaches dermis to underlying structures: areolar and adipose. Also known as subcutaneous layer or superficial fascia. Contains blood vessels and nerves: functions of integumentary system. Temperature regulation: evaporation of sweat decreases body t, changes in blood flow (more blood lose heat, less blood conserve heat) Protection: physical barrier to invasion, dehydration and uv radiation, contains cells of immune system. Sensation: nerve cells with receptors for pain, touch, pressure, temperature. Excretion: water and dissolved substances in sweat. Acts as a blood reservoir: flow can be shifted to hard-working muscles if needed. Vitamin d synthesis: epidermis makes inactive form of vitamin d upon exposure to uv, important in absorption of calcium, derivatives of the epidermis (skin appendages)
