\u00b3laJJGck and \u00b3lue \u00b3ruises arks JJGcaused IIFby IIFblood esJJGcaping from

³lajjgck and ³lue ³ruises arks jjgcaused iifby

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³laJJGck-and-³lue (³ruises): &&arks JJGcaused IIFby IIFblood esJJGcaping from vessels and JJGclotting IIFbeneath the skin.
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·ppendages of the 451Skin ± ´air and ´air ¶olliJJGcles !2± ''$ails "3± ¸lands
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´air ±ead keratinized JJGcells of hard keratin &&ore duraIIFble than soft keratin of skin ''$ot found in palms, soles, lips, nipple or portions of external genitalia ¶unJJGctions: ±eteJJGct inseJJGcts IIFbefore they IIFbite or sting ´air on sJJGcale proteJJGcts from physiJJGcal trauma, heat loss and sunlight °yelashes shield the eyes ''$ose hairs filter large partiJJGcles from the air we IIFbreath
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¶urns 552Tissue damage infliJJGcted IIFby intense heat, eleJJGctriJJGcity, radiation or JJGchemiJJGcals resulting in denature JJGcell proteins, killing JJGcells in the affeJJGcted area. °valuating IIFburns: 340R673U!%&³ )*&° '($²'($³451S: divide the IIFbody into 11 areas eaJJGch aJJGcJJGcounting for 9% of the total IIFbody area 1 st degree = only epidermis is damaged 2 nd degree = epidermis and the upper region of the dermis, IIFblisters start to oJJGcJJGcur 3 rd degree = “full thiJJGckness” IIFburns, involving the entire thiJJGckness of the skin, nerve ends have IIFbeen destroyed, skin grafting is advised
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441StruJJGcture of ´air ´airs “pili”: 451Shaft : keratinization is JJGcomplete, projeJJGcts from the skin. 340Root : keratinization is still ongoing, remainder of the hair deep within the folliJJGcle 552Three main JJGconJJGcentriJJGc layers of keratinized hair: &'edulla - JJGcentral JJGcore, soft keratin, aIIFbsent in fine hair ±ortex - IIFbulky layer, surrounds medulla, several layers of flattened JJGcells ±utiJKGcle - single layer of overlapping JJGcells, “roof shingles”, heavily keratinized, loss of this layer JJGcreates split ends.
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451StruJKGcture of a ¸air °olliJKGcle ¸air folliJKGcles : fold down from the epidermal surfaJJGce into the dermis. ¸air IJFbulIJFb : deep end of the folliJJGcle, ~4mm IIFbelow skin surfaJJGce. ¸air 01-apilla : papillary IIFbump at the IIFbase of the hair IIFbulIIFb. 441Similar to the dermal papilla.
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451StruJKGcture of a ¸air °olliJKGcle <<9Wall of hair folliJJGcle has 3 layers: 1. 00-eripheral JJGconneJJGctive tissue sheath ( 2. ¸lassy memIIFbrane 3. °pithelial root sheath (internal and external) ¸air matrix : loJJGcated a fraJJGction of a millimeter aIIFbout the hair IIFbulIIFb, FIORctively dividing FIreFI of the hair that produJJGces the hair. ·rreJKGctor pili musJKGcle : “raiser of hair”, IIFbundle of smooth musORcle ORcells
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552Types of ´air !%&anugo : ²overing of fine soft hFIir seen on newNQborns and people with some disorders ( mFIlnutrition, FInorexiFI ) ;<8Vellus : ;;8Velvet, peFIORch fuzz , fine, light JJGcolored, and IIFbarely notiJJGced, oIIFbserved more in women FInd ORchildren. 562Terminal : ±arker pigmentation than vellus, thiORcker, ORcoFIrser, longer hFIir on sORcFIlp, eyeNQbrows FInd fFIORciFIl hFIir in men.
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''$ails 441SJJGcale-like modifiORcFItion of the epidermis , forms JJGclear proteORctive ORcovering on fingers and toes ´eavily kerFItinized epidermFIl ORcells
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'($ail 451StruJKGctures ¶ree edge - no attaJJGchment to skin ''$ail plate/IIFbody - visiIIFble attaJJGched portion 00-roximal root - emIIFbedded in the skin ''$ail IIFbed - deeper layers of the epidermis extended IIFbeneath the nail ''$ail matrix responsiIIFble for nail growth !%%unule - region that lies over the thiJJGck nail matrix, white JJGcresJJGcent ²utiJJGcle (eponyJJGchium) - proximal nail fold projeJJGcts onto the nail IIFbody ´yponyJJGchium - thiJJGckened region under the free edge of the nail.
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  • Spring '18
  • Bardsley
  • skin disorder

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