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Integumentary System, Samantha Robles p.5 (Layers of Epidermis (Stratum…
Integumentary System, Samantha Robles p.5
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Body Membranes
Mucus Membrane (mucosa)
Contains epithelial cells, Goblet cells that present mucus production. Mucus restricted to respriatory tract. That is called phlegm in nasal passages.
Synovial Membrane
Connective tissue, soft areolar, NO EPITHELIAL TISSUE. Located in the fibrous line capsules surrounding joints. Its functions roduces synovial fluid, lubrication, reduce friction line bursae (sacs, around joints). Cusions organs moving against each other.
Serous Membrane (serosa)
Lines the body cavities and covers organ surfaces. Contains two types of tissues. The first one i Simple squamous epithelial layer. The second one is the Loose Connective tissue.
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Layers of Dermis
Deepest layer, dense connective tissue, 80% of the thickness of the dermis, lots of blood vessles matrix contains thick bundles of collagen fibers and elastic fibers.
Thin superficial layer, areolar connective tissue, loose connective tissue, superior surface is called Dermal Papillae, directly under the epidermis, contains light touch receptors called Meissner's corpuscles.
Layers of the Skin
Dermis (inner layer)
Dense fiborus CT with collagen and elastic fibers. Much THICKER. Contains blood vessels, nerve fibers etc.
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Epidermis (outer layer)
Keratinized stratified squamous epithelium. Avascular (WITHOUT BLOOD CELLS). Oxygen and nutrients disffuse from dermis.
Layers of Epidermis
Several cell layers thick of flattened cells, 8-10 cells thick, mitosis, DESMOSOMES.
3.Stratum granulosum
very thin region 3-5 layers, last layer the obtains nutrients from difusion, begins kertinization, cells die here, cells "toughen up" here.
2-3 layers clear, flat, dead, cells, translucent layer
Deepest layer closest to the dermis, basement membrane constantly dividing (mitosis), 90% keratinocytes, 10% melanocytes.
5.Stratum corneum
outer most layer 20-30 cells thick up to 200, protection against abrasion and penetration, water repellant.
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