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integumentary system

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Nurwahida Atira

on 9 October 2012

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Transcript of integumentary system

INTEGUMENTARY SYSTEM STRUCTURE OF SKIN Accessory Structure Of Skin What do you think that we will learn today? We will learn about First,it is all about Consist of Dermis SubQ / Hypodermis Epidermis stratified squamous epithelium no blood vessel Melanocyte Keratinocyte 4 Type of Cell Langerhan Cell Merkel Cell Stratum Basale/ Stratum Germinativum 5 distinct strata(layers) of cells Stratum Corneum Startum Lucidum Stratum Spinosum Stratum Granulosum in deepest layer
form touch receptor with sensory neuron produce keratin form bone marrow
provide immunity produce melanin pigment
melanin transferred to other cells with long cell processes 8 to 10 cell layer held together by desmosomes
Cell shrink and look
melanin taken in by phagocytosis from nearby melanocytes 3 to 5 layers of flat dying cell
show nuclear degeneration
contain dark-staining keratohyalin granules
contain lamellar granules contain precursor of keratin 25 to 30 layers of flat dead cell filled with keratin and surrounded by lipid
continuously shed
barrier to light, heat, water, chemicals & bacteria
friction stimulates callus formation connective tissue layer composed of collagen & elastic fibres, fibroblast, macrophages & fat cell contain:
hair follicle
blood vessel Papillary Region Reticular Papillary Major region dense irregular ct
contain interlacing collagen and elastic fibre
packed with oil gland,sweat gland ducts, fat & hair follicles
provide strength.extensibility & elasticity to skin
stretch mark: dermal tears from extreme stretching
epidermal ridges-form in fetus
ie: increase grip of hand top 20% dermis
loose CT and elastic fibre
finger like projection called dermal papillae
f(x): -anchor epi n dermis
-contain capillaries
-contain Meissner's corpuscle(touch)
and free nerve endings (pain & temp.) layer of adipose and areolar tissue Next Another next NAILS Tightly packed, keratinized cell Nail Body due to underlying capillaries Lunula white- thickened stratum basale Nail Matrix Eponychium
-stratum corneum layer HAIR Shaft wavy hair straight hair
contract with / form goosebump Resting Stage Growth Stage Old Hair falls out -last 2 - 6 years
-matrix produces
length last 3 month
matrix cell inactive & follicle atrophies normal: 70 - 100
hairs per day HAIR COLOUR =true melanin or =melanin+Fe+S =decline in melanin =has air bubble Glands Sebaceous (oil) gland Sebum Acne bacterial inflammation Sudoriferous (sweat) gland Eccrine most area
regulate Apocrine armpit n pubic region
secrete to duct open hair follicle
secretion more viscous Ceruminous Gland modified sweat gland produce waxy in Mammary (milk) gland barrier for entrance of foreign body vs Type Of Skin Thin Skin covers most of body
lack of stratum lucidum & epidermal ridges Thick Skin only on palm and soles
distinct stratum lucidum & thick stratum corneum
lack hair follicle and sebaceous gland Regulate body temperature Release sweat
by evaporate n perspiration Adjust flow of blood moderate=lower
extreme=increase & constriction of blood vessel
=increase Protection Sensory Receptor Excretion & Absorption salt,carbon dioxide,
ammonia,urea vit. A,D,E,K acetone & dry cleaning fluid, Pb, Hg, As, poison in poison ivy and oak 400ml Synthesis of Vit D activate by convert to calcitriol by enzyme in liver & kidney necessary for absorption of Ca Skin acts as a clue? detect disease Jaundice Cyanotic Erythema pigment Carotene yellow / orange hemoglobin red precursor vit A found in stratum corneum and dermis Melanin produced by melanocyte convert tyrosine to melanin increase Freckles albinism Vitiligo autoimmune loss of mealnocytes in a patch deepest germinate divide repeteadly cell cell basement membrane by desmosome & hemidesmosome thick skin & 3-5 layer clear,flat dead cell The end
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