Structures of the Integumentary System

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Structures of the Integumentary System

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  • Consists of 4 distinct cell types- kerotinocytes, merkel cells, melanocytes, and langerhans cells and 5 layers-stratum germinativum, stratum spinosum, stratum granulosum, stratum lucidum, and stratum corneum.Thickness of the epidermis varies throughout the body- the thinnest is the eyelids and the thickest is the palms of hands and soles of feetThe surface layer (stratum corneum) consists of dead cells rich in keratin. Keratin is a protein that renders the skin dry and provides a waterproof covering thus resisting evaporation and preventing excessive water loss. Serves as a barrier against uv light, bacteria, abrasions, and some chemicals.
  • Thicker inner skinMany nerve receptors of different types in this layer.
  • Hair is everywhere on the body except palms of hands, soles of feet, glans penis, and inner surface of the vaginal labia.Root - the part of the hair that is implanted in the skinShaft- projects from the skin surfaceHair follicle- an inpocketing of the epidermis where the root is embeddedCuticle layer- single layer of flat scale like kertanized cells that overlap each otherCortex- elongated kertanized nonliving cells…hair pigment in this layerMedulla- inner layer of hairPapilla- located towards the lower end of the hair follicle is a tuft of tissue which contains capillaries Arrectorpili muscle- attached to each hair follicle on the side
  • Hard structure covering the dorsal surfaces of the phalanges of the fingers and toes. Slightly convex on upper surface and slightly concave on the lower surfacesFormed in the nail bed or matrix . Epidermal cells first appear as elongated cells. These cells fuse together to form hard kertanized plates.
  • Located all over the skin surface. Tubular with a coiled base and a tubelike duct that extends out to form a pore in the skin.
  • Structures of the Integumentary System

    1. 1. Essential QuestionsWhat are the structures of theintegumentary system?3.05 Remember the structures of theintegumentary system 2
    2. 2. Structures of the integumentary systemLayers of the integumentary system Epidermis Dermis Subcutaneous3.05 Remember the structures of theintegumentary system 3
    3. 3. Structures of the integumentary systemEpidermis Outermost covering Made of epithelial cells Avascular3.05 Remember the structures of theintegumentary system 4
    4. 4. Structures of the integumentary systemDermis True skin Made of connectivetissue Vascular3.05 Remember the structures of theintegumentary system 5
    5. 5. Structures of the integumentary systemDermis contains manystructures (organs) Connective tissue Collagen tissue bands Elastic fibers Numerous blood vessels Nerve endings Muscles Hair follicles Oil glands Sweat glands Fat cells3.05 Remember the structures of theintegumentary system 6subcutaneous
    6. 6. Structures of the integumentary systemSubcutaneous layer Hypodermal Sometimes calledsuperficial fascia Consists of looseconnective tissue Contains one-half of thebody’s stored adiposetissue3.05 Remember the structures of theintegumentary system 7subcutaneousepidermis,dermis
    7. 7. Structures of the integumentary systemWith age, thesubcutaneous layerbegins to disappear;this causes the skin tosag and wrinkle.3.05 Remember the structures of theintegumentary system 8subcutaneousepidermis,dermis
    8. 8. Structures of the integumentary systemAppendages Hair Nails Glands Sweat glands Sebaceous glands3.05 Remember the structures of theintegumentary system 9subcutaneousepidermis,dermis
    9. 9. Structures of the integumentary systemHair Root Shaft Cuticle layer Cortex Medulla Hair follicle Papilla Arrector pili muscle3.05 Remember the structures of theintegumentary system 10
    10. 10. Structures of the integumentary systemNails Made of keratin Originate from the nailroot3.05 Remember the structures of theintegumentary system 11
    11. 11. Structures of the integumentary systemSudoriferous glands Sweat glands Present in largenumbers under arms,palms of hands, andsoles of feet3.05 Remember the structures of theintegumentary system 12
    12. 12. Structures of the integumentary systemSebaceous glands microscopic glands located adjacent to ahair follicle3.05 Remember the structures of theintegumentary system 13
    13. 13. Structures of the integumentary system Microscopic viewof the skin143.05 Remember the structures of theintegumentary system
    14. 14. Essential QuestionsWhat are the structures of theintegumentary system?3.05 Remember the structures of theintegumentary system 15

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