Term
| Characteristics of the Integumantary system |
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Definition
| -Consist of the skin, nails, hair and glands. Its function are: protection, sensation, regulated body temperature, vitamin D production, excretion of small amount of waste products |
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Term
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Definition
| Outermost region, resist abrasion, reduces water loss. Composed of Keritanized stratisfied squamous epithelium consisting of four distinctive cell types and four or five layers. Cell types include: Keratinocytes, Melanocytes, Merkel cells and Langerhans' cells |
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Definition
| -Most abundant cell type in the skin |
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Definition
| -Produces the brown pigment melanin |
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| Thouch receptors in association with sensory nerve endings |
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Definition
| Basal Layer, deepest epidermal layer firmly attacthed to the dermis. Structural streght is provided by desmosomes and hemidesmosomes. consit of a single layer of the youngest keratinocytes. cells undergo miotic division every 19 days |
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Definition
| Melanin granules and Lagerhans' cells are abundant in this layer. Melanin is take up by the keratinocytes and accumulates on the "sunny side" to protect the nucleus from UV damage |
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Definition
| Drastic changes in keratinocytes apperance occurs. Keratinocytes and lamellated bodies accumulate in this cell layer. above this layer the epithelial cells die because they are too far away from the connective tissue |
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Definition
| thin transparent band superficial to the stratum granulosum, consist of a few rows of flat dead keratinocytes, only present in thick skin (palms of the hands and soles of the feet) |
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Definition
| outermost layer of keratinized cells, accounts for 3/4 of the epidermal thickness, 20-30 cell layers thick all dead cells. totaly new every 25-45 days |
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Definition
| Produce melanin inside melanosomes and the transfer the melanin to keratinocytes. size and distribution determine skin color |
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Definition
| Second major skin region containing strong flexible connective tissue. Cell types include fibroblast, adipose cell and macrophanges. composed of two layers: papilary and reticular |
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Term
| Papillary Layer of the Dermis |
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Definition
| Areolar connective tissue with collagen and ellastic fibers. Its superior surface contains peg like projections called dermal papillae. responsible for fingerprints and footprints (films of sweat) containd blood vessels that supply nutrients to the overlying epidermis |
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Term
| Reticular layer of the dermis |
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Definition
| Dense irregular connective tissue, accounts for aprox 80% of the thickness of the skin. collagen fibers in this layer add streght and resiliency to the skin. Elastin and collagen fibers are oriented more in one direction and produce clevage or tesion lines. |
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Definition
| Deepest part of the skin, composed of mostly adipose and areolar connective tissue. Not really skin, stores fat and connects the skin to underlying structures |
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Definition
| (fetal hair) is replaced near the time of birth by terminal hairs(scalp, eyelids, eyebrows) and vellus hair(soft hair) |
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Term
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Definition
| Hair are colums of dead, keratinized epithelial cells. each hair consist of: |
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Definition
| a smooth muscle that when contracts makes the hair stand up |
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Definition
| simple or compund, found all over the body except the palms of your hands and soles of the feet. secrete an oily secretion called sebum when stimulated by hormones |
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Definition
| produces sweat via exocitocys, which cools the body. highly concentrated in the palm of the hand and soles of the feet. |
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Definition
| Found in the axilary and the genital area. ducts empty into hair follicle, produce an organinc secretion that when broken down by bacteria causes body odor. |
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Definition
| Modified mericrine gland in external ear canal that secrete cerumen(ear wax) |
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Definition
| Specialized swat gland that secrete milk. |
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Term
| Characteristics of the Nail |
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Definition
| The nail is stratum corneum containg hard keratin. the nail root is covered by the skin. the nail body is the vissible part of the nail. |
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Term
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Definition
| Nearly all of the nail is formed by the nail matrix, but the nail bed contributes |
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Term
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Definition
| is the part of the nail matrix that is vissble througth the nail body. |
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Term
| Characteristics of Melanoma |
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Definition
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