Download - The Skin in Health & Disease
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The Skin in Health & Disease
Chapter 6
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outline• Structure of the skin
– Epidermis• Stratum basale• Stratum corneum
– Dermis– Hypodermis
• Accessory structure of the skin– Glands
• Sebaceous (oil) glands• Sudoriferous (sweat) glands
– Eccrine– apocrine
– Hair – Nails
• Functions of the skin
• Observation of the skinColor
pigmentdiscoloration
Lesionssurfacedeeper
Burns• Tissue repair• Skin aging• Care of the skin• Skin disorders
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Integumentary System• Skin and associated
structures form integumentary system
• A membrane enveloping the body
• Accessory structures aka appendages– Glands– Hair – nails
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• Consists of two layers:– Epidermis – outer layer.
Subdivided into thin layers called strata. Composed entirely of epithelial cells, no blood vesseles.
– Dermis – “true skin”. Framework of connective tissues and contains: Blood vessels, nerve endings, and glands
I. Structure of the Skin
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a. Epidermis• Outermost surface of skin• Avascular – nourished by capillaries in underlying
dermis• In the deepest layer, Stratum basale or stratum
germinativum, new cells are produced and pushed upward
• As the cells die, their cytoplasm is replaced by protein called keratin which tickens and protects the skin forming the upper layer of epidermis, stratum corneum
• Exfoliation – the constant loss and replacement of cells
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b. Dermis – “True Skin”
• Framework of elastic connective tissue• Extensive blood & nerve supply• Most appendages in the dermis• Dermal papillae – extensions into the
epidermis to allow for increased blood supply to the epidermis– Distinct ridge pattern which also help for grip– Basis of fingerprints & footprints
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Dermal Papillae
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Checkpoint 6-1: The skin and all its associated structures comprise a body system. What is the name of this system?
Checkpoint 6-2: The skin itself is composed of two layers. Moving from the superficial to the deeper layer, what are the names of these two layers?
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c. Subcutaneous Layer - Hypodermis
• Connects skin to surface muscles
• Composed of areolar & adipose tissue
• Connected to dermis with continuous bundles of elastic fibers
• Rich blood and nerve supply
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• Glands– Sebaceous
(oil) glands– Sudoriferous
(sweat) glands
• Nails • Hairs
II. Accessory Structures of Skin
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a. Sebaceous (Oil) Glands• Saclike exocrine
glands with ducts that open into hair follicles
• Secrete sebum– Lubricates skin– Prevents drying
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b. Sudoriferous (sweat) Glands• Coiled exocrine glands in dermis
& subcutaneous tissue• Eccrine – most numerous
– Ducts release sweat directly onto surface of the skin as a pore
– Cool the body• Apocrine – at armpits & groin
– Activate at puberty – Secrete in response to emotional
stress & sexual stimulation– Body odor results from bacteria
breaking down substances secreted from these glands
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Sweat Glands
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Sudoriferous Glands• Ceruminous
glands – secrete ear wax (cerumen)
• Ciliary glands – at edges of eyelids
• Mammary glands – in breast
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c. Hair• Covers almost entire
body– Except palms, soles,
nipples, lips, some regions of external genitals
• Nonliving – composed mainly of keratin
• Developed from living cells in a bulb
• Melanocytes give hair its color
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Hair Continued• Hair follicle – sheath
of connective & epithelial tissue that encloses hair
• Shaft – part of hair above the skin
• Arrector pili – involuntary smooth muscle that forms goose bumps; causes release of sebum when contracts
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d. Nails
• Function– Protect fingers and toe– Help in grasping
objects• Made of keratin • Changes in nails can
be a result of disease processes
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Nails• Structure
– Nail root – under skin, where new cells grow
– Nail plate – part of nail overlying skin
– Nail bed – epithelial tissue under nail plate
– Lanula – covers growing region of nail
– Cuticle – extension of stratum corneum, seals space between nail plate and nail root
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• Skin does NOT breathe• Protection against infection• Protection against dehydration• Regulation of body temperature• Collection of sensory information• Other minor skin functions
– Limited absorption– Minimal excretion– Manufacture of Vitamin D
III. Skin Functions
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Skin Functions
• Protection against infection– Stratum corneum is in a tight interlocking
pattern & constantly being shed• Protection against dehydration
– Keratin and sebum waterproof the skin and prevent water loss
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Skin Functions
• Regulation of body temperature– Excess heat dissipated
• Large surface for heat to radiate into environment• Vessels dilate to allow heat loss• Sweat glands cause perspiration, which dissipates
heat when it evaporates from surface of skin– Protection from cold
• Vessels constrict to diminish heat loss– Most blood supply to skin is for temperature
regulation
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Skin Functions• Skin is one of chief
sensory organs of body• Collection of sensory
information– Free nerve endings
• Pain• Temperature
– Sensory receptors• Light touch – Meissner
corpuscle• Deep pressure –
Pacinian corpuscle
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Minor Skin Functions
• Limited absorption– Estrogens or steroids– Most skin medications are topical & local only
• Minor excretion– Electrolytes (salts) – Some nitrogen-containing wastes
• Vitamin D production– Needed for bone health– Manufactured in skin under UV radiation
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a. Color
• Dependant on many factors– Amount of pigmentation– Blood flow to surface blood
vessels– Quality of blood flow to
surface vessels• Quantity of oxygen• Concentration of hemoglobin• Presence of compounds
such as bile
IV. Observation of the skin
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Skin Pigmentation
• Melanin – main skin pigment– Also found in hair, iris of
the eye, middle coat of the eyeball
– Protects against UV radiation– Tanning – normal increase in
melanin• Albinism – hereditary lack of
pigment in skin, hair & eyes• Carotene – in orange & yellow
vegetables and stored in fatty tissue & skin
• Hemoglobin – seen in vessels near surface
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Albinism
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Discoloration of Skin• Pallor – is paleness of the skin. Paleness often due to loss of blood
supply or loss of hemoglobin– Most easily noted in lips, nail beds, mucous membranes
• Flushing – reddening of skin, often related to fever– Most noticeable in face and neck
• Cyanosis – bluish tone as a result of loss of oxygen – Symptom of heart failure breathing problems
• Jaundice – yellowish skin due to excessive bile pigments from liver, mainly bilirubin – Tumors, inflammation of liver (hepatitis), some blood diseases– Neonates with immature livers may not be able to process bilirubin
• Carotenemia – excessive intake of carrots leading to jaundice
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Pallor Cyanosis
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Cyanosis Jaundice
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Jaundice Carotenemia
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b. Skin Lesions
• Lesion – any wound or local damage to tissue
• Surface lesions –– Rashes - flat– Eruptions – raised– Erythema – redness of skin due to
inflammation• Deep lesions• Burns
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Surface Skin Lesions• Macule – flat spot, neither raised or depressed
– measles – freckles
• Papule – firm raised bump – Pimple– Nodule – large papule
• Vesicle – raised area filled with fluid– Aka bulla– Chickenpox
• Pustule – raised area filled with pus– Infected vesicles
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Stages of Chickenpox
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Deep Skin Lesions• Excoriation – a scratch• Laceration – rough
jagged wound due to skin tearing
• Ulcer – due to disintegration death of tissue– Decubitis ulcer – bed
sore• Fissure – crack in skin
– Athlete’s foot
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Burns to Skin• Caused by heat,
electricity, chemicals, abrasions
• Assessed in terms of depth and %age of body surface involved
• Replaces 1st, 2nd & 3rd degree burn classification
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Classifying Skin Burns - DepthSuperficial partial-
thickness – epidermal involvement, may or may not be dermis involvement,• Reddened, may
blister• Like a sunburn
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Classifying Skin Burns - DepthDeep partial-
thickness – epidermal and some dermal involvement • Blistered,
broken skin with weeping appearance
• Scalded appearance
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Classifying Skin Burns - Depth• Full-thickness –
epidermis, entire dermis and possibly some hypodermis
• Broken, dry, pale skin
• Charring may be present
• May require grafting or loss of tissue
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Classifying Burns to Skin – Body Surface Area
• Rule of nines– Body surface is
assigned percentage in multiples of nine
• Lund & Browder – more accurate, divides body into small areas
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Burns
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Complications of Burns• Infection• Respiratory
complications• Circulatory problems• Psychological impact• http://www.metacafe.c
om/watch/888126/drunk_driving_jacqueline_saburido/
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Sunburn• Excessive exposure
to UV radiation• Acute - sunburn• Chronic
– Skin cancer – basal cell & squamous cell carcinoma, malignant melanoma
– Wrinkling, age spots and “leathering”
• Tanning no safer than sunlight
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SPF Sun Protection Factor• A measure of UVB protection • Ranges from 1 to 45 or above. • An SPF of 15 will delay sunburn in a person who would otherwise
burn in 10 minutes to burn in 150 minutes. The SPF 15 sunscreen allows a person to stay out in the sun 15 times longer.
• There is currently no uniform measure of UVA absorption so SPF does not predict UVA protection
• The "protectiveness" of clothing can also be measured by SPF. The following are SPF's of various types of clothing: – Nylon Stockings - SPF 2 – Hats - SPF 3-6 – Summer-weight clothing - SPF 6.5 – Sun-protective clothing - up to SPF 30
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• Begins after clotting & scabbing protects underlying tissue
• Healing occurs from the inside out in wounds
• Scar aka cicatrix – growth of connective tissue – strong but not flexible – Keloid – excessive
scar tissue
v. Skin Tissue Repair
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Keloid
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• Loss of fat & collagen• Thinning of dermis – “parchment skin”• Circulation declines – decreased ability to
tolerate cold• Decreased melanin production – grey hair• Decreased sebum secretion• Decreased eccrine & apocrine glands so
decreased ability to tolerate heat
VI. Aging & Integumentary System
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A. Young Skin B. Old Skin
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• Dermatitis• Psoriasis• Cancer• Acne & other skin infections• Alopecia• Allergies• Autoimmune disorders• Pressure ulcers
VII. Skin Disorders
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Dermatitis
• Inflammation of skin due to an irritant• Atopic dermatitis – aka eczema – intense
itching and skin inflammation with erythema, vesicles, papules, scaling crusting – Generally begins in childhood and becomes
recurrent– Excessively sensitive skin – Often accompanied by other allergic disorders
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Dermatitis
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Psoraisis• Chronic overgrowth of
epidermis • Large outlined
erythematic plaques covered with silvery scales
• Chronic, recurrent with hereditary pattern
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Psoraisis
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Skin Cancer
• Most common form of cancer in USA• Epidermal skin cancers
• Basal cell and squamous cell carcinoma• Face, neck & hands• Squamous cell most likely to metastisize but both
are treatable• Melanoma – from moles (nevi) –
• irregular border & shape, uneven color, larger than pencil eraser size
• History of severe blistering sunburn is predisposing factor
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Acne & Skin Infections• Acne vulgarus –
infection of sebaceous glands
• Impetigo – acute contagious staphylo-coccal infection; associated with lower socioeconomic status
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Viral Skin Infections
• Herpes simplex virus – cold sores– Type I – around mouth– Type II - genital
• Shingles (herpes zoster) – same virus that causes chickenpox; follows nerve pathway and can last longer than a year; can be extremely painful
• Wart (verruca) – human papillomavirus– Genital warts associated with cervical cancer
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Herpes Zoster
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Fungal Skin Infections• Tinea (ringworm) corporis
– On foot – athlete’s foot– Can grow under acrylic nails– Difficult to treat
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Alopecia• Baldness • Male pattern baldness• Can be due to
disease or drug therapy
• Alopecia areata –sudden loss of either patches of hair or all hair
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Alopecia Areata Totalis
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Allergy• Hypersensitivity to an
irritant that causes an unfavorable immune response
• Pruritus – itching• Urticaria – hives –
elevated patches also called wheals
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Autoimmune Disorders• Immune reaction to one’s own tissues• Pemphigus – epidermal layer separates from dermis,
causing bullae (large blisters)• Fatal unless immune system suppressed
• Lupus erythematosus – chronic, inflammation of connective tissue
• Discoid lupus erythematosus – skin only• Systemic lupus erythematosus – involves skin & other
organs• Butterfly rash on cheeks• Worsened with sun exposure
• Scleroderma – overproduction of collagen causing thickening & tightening of skin
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Pemphigus
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Lupus
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Scleroderma
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Pressure Ulcers – Decubitis Ulcers
• Appear when body weight is on skin for prolonged time without moving
• Bony projections, heels,
• First appear as redness and can progress all the way to the bone
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Decubitis Ulcer