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Membranes Integument

Membranes. Continuous sheets of cell aggregations that form barrier layer(s)Comprised of epithelial

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Membranes Integument

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    1. Membranes & Integument Chapter 3 & 4

    2. Membranes Continuous sheets of cell aggregations that form barrier layer(s) Comprised of epithelial & connective tissue Function- Barriers- basement membrane Cover, line & protect May provide moisture

    3. Membrane Types Serous membrane Mucous membrane Synovial membrane Cutaneous membrane

    4. Serous Membrane Line sealed internal division of ventral body cavities Structure Simple squamous epithelium Areolar connective tissue Location- line cavities & organs 2 components Parietal & visceral Function- reduces friction Provides moisture- Transudate Serous membrane examples Pleura Peritoneum Pericardium endothelium

    5. Endothelium

    6. Mucous Membranes Aka mucosa Structure Simple or stratified epithelia Areolar connective tissue Functions- protective barrier Epithelia moist with secretions Mucus, urine, semen, saliva Absorb, secrete, protect Locations-Line cavities that communicate with the exterior Digestive- simple columnar Respiratory- pseudostratified Mouth- stratified squamous Urinary tract- transitional

    7. Goblet Cell

    8. Synovial Membrane Line joint cavities & line hyaline cartilage of bone ends Structure- Discontinuous simple squamous or cuboidal epithelium Areolar connective tissue Function- secrete synovial fluid fibroblast Lubricate & nourish joint cartilage MAcrophage Immune defends joint Location- line & enclose moveable joints Knee, elbow, shoulder, hips

    9. Synovial Membrane

    10. Cutaneous Membrane Function- protection Dry membrane Location- covers body surface Majority of skin but NOT all Structure Stratified squamous epithelium- epidermis Loose areolar CT Proper- dermis Dense CT Proper- dermis

    11. Integumentary System Largest organ- 18 sq ft 14% of body weight Aka Integument Organ system Forms continuous sheet of cells covering the bodies surface Contains all 4 primary tissues 2 components Cutaneous membrane Epidermis, dermis, (hypodermis) Accessory structures Hair, nails, glands

    14. Integument Functions Protection Temperature maintenance Nutrient synthesis & storage Sensory reception Excretion & secretion

    15. Protection from Abrasion

    16. Protection from Dehydration & Pathogens

    17. Protection from Pathogens

    18. Protection from UV

    19. Melanin

    21. Temperature Maintenance Vasoconstriction Vasodialation

    22. Nutrient Synthesis & Storage

    23. Ricketts

    24. Storage- Fat Mouse

    25. Sensory Reception

    26. Excretion & Secretion Human fingertip surface showing fingerprint ridges and sweat droplets

    27. Epidermis Stratified Squamous Epithelium - multiple layers with multiple cell types Protective Keratinized Avascular High regeneration rate

    28. Epidermis Cells Keratinocytes Keratin Melanocytes- melanin Merkel’s cells- reception Langerhan’s cells- immune Protein fibers- strength & flexibility

    29. Keratinocytes Primary cell of epidermis- 90% Contain lots of keratin Horn Hydrophobic Abrasion & dessication protection

    30. Melanocytes Relatively small component of epidermis- 6% Protects against UV Melanin- light absorption pigment Stimulated by UV exposure

    31. Melanoma

    32. Langerhans Cells 3-8% Immune function Assists immune function

    33. Merkel Cells Less than 2% Specialized sensory cells Pressure & touch Increase sensitivity in areas lacking hair (glabrous skin)

    34. Merkel Cells

    35. Epidermis Layers Aka strata Stratum corneum Stratum lucidum Stratum granulosum Stratum spinosum Stratum germinativum (aka Basale)

    37. Stratum Corneum Corneum= “horny” Dry, water resistant Primarily keratinocytes Enucleate Dead cells Thickness varies on abrasion Few- 30 layers

    39. Stratum Lucidum Lucidus = clear Only visible in thick skin 3-5 layers of keratinocytes

    40. Thick Skin

    41. Thin Skin

    42. Stratum Granulosum Granulum= little grain Keratohyalin granules

    44. Stratum Spinosum Spina = prickly Keratinocytes 8-10 layers Contains Langerhans cells

    46. Stratum Germinativum Aka basale Germen = “sprout” Deepest single layer of germative cells Adult stem cells Pleuripotent- hair, gland, epi Contains Melanocytes Skin pigmentation

    48. Basal Cell Carcinoma

    50. Epidermis Et. Al.

    51. Skin Mites

    52. Epidermis Fauna

    53. Dust Mites

    54. dermis

    55. dermis

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