OHS 508 Chapter Notes - Chapter 6: Formaldehyde, Haloalkane, Hydrophile
30 May 2016
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Thickness of this layer is different in different areas of the body. Top layer is composed of dead cells called stratum corneum, the keratin layer, or the horny layer. Horny layer is the main barrier of the skin against environmental agents chemicals such as organic solvents (which are lipid-soluble) and alkalis can pass through the epidermis layer. New cells are formed and pushed to the surface to replace the stratum corneum. Characteristic regenerative or sloughing process takes about 28 days to complete. Among germinal cells, there are melanocytes, which manufacture melanin skin colour. No blood cells in the epidermis, cells are bathed in lymph fluid. No nerve cells but free nerve endings in dermis layer such as heat, cold, pain, and pressure sensors. Made up of connective tissue, hair follicles, sweat glands, sebaceous glands, blood vessels, and nerve cells. Provides primary protection against physical trauma and can form scar tissue to maintain integrity of the system.
