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MODULE-4-Integumentary-System.pdf - ANATOMY & PHYSIOLOGY ●...

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ANATOMY &PHYSIOLOGYI.INTEGUMENTARY SYSTEMconsist of the skin and accessorystructures, such as hair, nails, glands.Integument means coveringFUNCTIONS OF THE INTEGUMENTARYSYSTEMProtection- The skin provides protectionagainst abrasion and ultraviolet light.Sensation -The integumentary system hassensory receptors that can detect heat, cold,touch, pressure, and pain.Vitamin D production- When exposed toultraviolet light, the skin produces a moleculethat can be transformed into vitamin DTemperature regulation- Body temperature isregulated by controlling blood flow through theskin and the activity of sweat glandExcretion - Small amounts of waste productsare lost through the skin and in gland secretions.II.SKINSkin- biggest organ in the bodyThick skinThin skinInvolves all the fiveepithelial strataCovers the rest of bodyAreas subject topressure or frictionMore flexible and thinPalms, Fingertips, solesof feetStratum lucidum isabsentHair is foundCallus- stratum corneum increases inthicknessCorn- skin over bony prominences developa cone shaped structureStratified squamous epithelium; in itsdeepest layers, new cells are produced bymitosisKeratinization; cell change shape andchemical composition by replacing keratinin the outermost cells of the epidermisKeratin; makes cells more rigid and durableContains strata four/five strata1
ANATOMY &PHYSIOLOGYSuperficial layer of the skinNo blood vessels
Keratinocytes- major cells found in skinOther cells:Melanocytes - produces melaninLangerhans cells - immunity systemMerkel cells - detect light touch andsuperficial pressure1.Stratum Basale -is attached to basementmembrane by hemidesmosomes andepidermal ridges (e.g., fingerprints)Cells : Keratinocytes, Melanocytes,Langerhans cells and Merkel Cells
2.Stratum Spinosum -The spiny layera.Superficial to stratum basaleb.Lamellar bodies - keratin fibers andlipid filled organelles formed insidethe cellc.Produced by division of stratumbasale3.Stratum Granulosum-Keratohyalin granules

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Term
Spring
Professor
N/A
Tags
Stratum Corneum, Skin anatomy

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