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Cards In This Set
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What are the 3 main layers of the skin?
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Epidermis, dermis, and hypodermis
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Give a brief description of the HYPODERMIS
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The layer of the skin that consists of AREOLAR and ADIPOSE tissue.
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Give a brief description of the DERMIS
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The deeper, thicker, CONNECTIVE tissue part of the skin.
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Give a brief description of the EPIDERMIS
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The superficial, thinner portion, which is composed of EPITHELIAL tissue.
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What are LAMELLATED CORPUSCLES?
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Nerve endings in the SUBCUTANEOUS layer that are sensitive to pressure.
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What are KERATINOCYTES and why are they important?
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The most numerous of the epithelial cells (about 90%); they produce KERATIN. Keratin helps protect the skin and underlying tissues.
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What are MELANOCYTES and why are they important?
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Pigmented cells that are located between or beneath cells of the deepest layer of the epidermis , that synthesizes MELANIN. Melanin absorbs damaging UV light. They constitute about 8% of epidermal cells.
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What are are LANGERHANS CELLS and why are they important?
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Epidermal cells that arise from red bone marrow and migrate to the epidermis, where they constitute a very small amount of the epidermal cells. They PARTICIPATE IN IMMUNE RESPONSES mounted against microbes that invade the skin.
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What are MERKEL CELLS and why are they important?
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They are the least numerous of the epidermal cells; They lie in the epidermis of hairless skin where they make contact with a tactile (merkel) disc, which functions in touch. They detect different aspects of TOUCH SENSATIONS.
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What are the four principal types of EPIDERMAL cells?
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Keratinocytes, melanocytes Langerhans cells, and Merkel cells.
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What is the STRATUM BASALE?
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The DEEPEST layer of the EPIDERMIS
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Why are the stem cells in the STRATUM BASALE important?
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They produce KERATINOCYTES.
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What is the STRATUM SPINOSUM?
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The layer SUPERFICIAL to the STRATUM BASALE
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What types of cells would you find in the STRATUM SPINOSUM?
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Keratinocytes, Langerhans cells, and melanocytes.
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What is the STRATUM LUCIDIUM?
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The layer that is only found in the THICK skin of the fingertips, palms, and soles. contains KERATINOCYTES.
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