Term
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Definition
| - made up of keratinized stratified squamous epithelium |
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Term
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Definition
- produce the water insoluble protein keratin whichhardens structures
- Approx. 90% of Epidermal cells |
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Term
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Definition
- produce melanin, a brown/black pigment which absorbs UVlight and is the primary skin pigment
- Approx. 8% of Epidermal cells |
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Term
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Definition
- produced in the bone marrow
- help provide immunity to the epidermis |
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Term
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Definition
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Term
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Definition
- a single layer of cuboidal shaped cells
- mitotically active |
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Term
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Definition
- 8 to 10 cell layers thick
- cells start to flatten as they reach the upper part ofthis layer |
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Term
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Definition
- 3 to 5 cell layers thick
- cells continue to flatten out
- cells begin to die forming a water resistant barrier,i.e. keratinization |
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Term
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Definition
- only present on the finger tips, palms and soles of thefeet
- 3 to 5 layers of cells |
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Term
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Definition
- 20 to 30 cell layers in thickness
- flattened dead keratinocytes, no nuclei
- outer layers are continually shed needing to bereplaced
- Approx. 3/4 of the epidermal thickness |
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Term
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Definition
- mostly connective tissue containing collagen & elastinfibers, few cells
- two regions (layers): |
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Term
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Definition
- superficial portion
- Dermal Papillae = tiny projections into the epidermis whichincrease the surface area of the Stratum Basale
- Meissner corpuscles (corpuscles of touch) = tactilereceptors located at the apex of Dermal Papillae
- Epidermal Ridges = Dermatoglyphs = Finger prints
assoc. with the underlying papillae |
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Term
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Definition
- deepest and largest portion
- contains irregular C.T. |
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Term
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Definition
- composed of Adipose and Areolar C.T.
- stores fat
- contains vessels and nerves that supply the skin |
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Term
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Definition
- brown/black pigment produced from Melanocytes
- made from amino acid Tyrosine (Tyrosinase)
- disorders: Albinism, Vitiligo |
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Term
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Definition
- a yellow/orange pigment; not assoc. with jaundice
- assoc. with vitamin A |
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Term
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Definition
- pink/red pigment
- the oxygen carrying molecule in RBCs
- assoc. with translucent skin (i.e. skin lacking melanin) |
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Term
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Definition
- covers most skin surfaces
- columns of dead keratinized cells that are bonded together
- protects the body from heat loss and UV light |
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Term
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Definition
= portion of the hair above the surface of the skin
= portion of the hair below the surface
= tissue that surrounds the root of the skin |
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Term
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Definition
| - plates of tightly packed, keratinized epidermal cells |
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Term
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Definition
- secrete sebum, an oily substance that softens and lubricatesthe skin, water proofing, maintains hair follicles,contains antibacterial substances
- associated with hair follicles, lips, pubic region
- not found on palms and soles |
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Term
| Sudoriferous (Sweat) Glands |
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Definition
| - release secretions onto the surface of the skin |
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Term
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Definition
- most common
- produces watery sweat that contains ions and small organicmolecules
- help regulate body temperature, eliminate wastes |
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Term
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Definition
- common to axilla and groin
- watery secretion, more viscous than normal sweat, containsproteins and lipids
- secondary sexual function |
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Term
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Definition
- when only the Epidermis is damaged
- the cells surrounding the wound enlarge and migrate to fillthe gap created by the injury
- mitosis in the Stratum Basale is stimulated, more cells arereproduced to make up for dead cells |
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Term
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Definition
| migration ceases when the cells on bothsides of the wound come into contact |
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Term
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Definition
- clot forms over wound
- local vasodilation, leukocytes (to fight infection) andfibroblasts (rebuild tissue) move into the damaged area |
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Term
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Definition
- scab forms
- granulation (scar) tissue is laid down beneath the scab
- vessels begin to regrow |
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Term
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Definition
- epithelial tissues begin to mature
- collagen is laid down randomly |
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Term
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Definition
- the scab falls off after the epidermis is restored
- circulation is restored
- fibroblasts decrease in number |
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Term
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Definition
| The process of scar tissue formation. Scar tissue isnot as healthy as the original tissue. |
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Term
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Definition
| Uncontrolled fibrosis. Contact inhibition does not occurso the scar tissue does not stay with in the boundary ofthe wound. |
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Term
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Definition
- collagen and elastin fibers stiffen and lose elasticity
- decreased activity of sweat and sebaceous glands
- subcutaneous fat decreases |
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Term
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Definition
| most common, arises from cells ofstratum basale, rarely metastasizes |
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Term
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Definition
- fairly rare but has high metastasis rate,
cancer of the melanocyte |
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Term
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Definition
| - skin type, amount of sun exposure, family history, age,immune status |
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Term
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Definition
| - tissue damage caused by excessive heat, radioactivity, orchemicals that denature proteins in skin cell |
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Term
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Definition
| - only the epidermis is damaged |
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Term
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Definition
| - damage goes through the epidermis and into the dermis |
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