ANSC 2340 Chapter Notes - Chapter 6: Telogen Effluvium, Loose Connective Tissue, Stratum Spinosum
15 Jan 2017
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Document Summary
Take information from touch and pressure and transmit this info to the central nervous. Synthesis of vitamin d and storage of nutrients. Thickest in the centre of the back, between the shoulder blades and paw pads. Outer is epidermis, middle is dermis (corium), inner is hypodermis. Creates infolds and outpouching called dermal papilae. Dermal papilae help the two layers to hold together. Majority of the cells found in epidermis. Produce keratin, which is a tough, fibrous, waterproof protein. As inner keratinocytes grow and divide, the older cells get pushed outwards. They start to lose their nuclei, cytosol, and organelles. New epidermis forms in humans every 7-8 weeks. Have tentacles that project and reach all keratinocytes. Melanin is stored in membrane-bound granule melanosome. Melanosomes get released by the tips of the melanocyte projection and get absorbed by keratinocytes. Keratinocytes use melanin to protect themselves from uv radiation. Originates in the bone marrows, then migrates to the skin.
