PNB 2264 Lecture Notes - Lecture 6: Vasodilation, Melanin, Desmosome
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23 Jan 2017
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Adjacent to the blood supply in the dermis not epithelial (epithelial does not have a blood supply) Close enough to be alive and active. Network of irregularly arranged collagen fibers (give toughness and strength to layer) Three types of protein fibers in connective tissues. Macrophages - control bacteria and other substances we want to get rid of. Rich blood supply fight/flight response constrict vessels to the skin and shunt them to the core in order to save your life . Toughness of inner reticular layer of dermis. Hot can dilate vessels send blood to skin heat can radiate away from body. As long as environmental temp is less than you are. Cold constrict vessels and shunt blood toward core. Skin is richly innervated with sensory neurons. Learning objectives: describe the structure and function of skin. Structure of skin: epidermis = epithelial tissue: stratified squamous keratinizing epithelium to form a waterproof covering.
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