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Skin and Body Membranes Chapter 4 2 Types of Body Membranes A. Epithelial and B. Connective A.Epithelial Membrane=Skin, Mucous Membrane, Serous Membrane.

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Presentation on theme: "Skin and Body Membranes Chapter 4 2 Types of Body Membranes A. Epithelial and B. Connective A.Epithelial Membrane=Skin, Mucous Membrane, Serous Membrane."— Presentation transcript:

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2 Skin and Body Membranes Chapter 4 2 Types of Body Membranes A. Epithelial and B. Connective A.Epithelial Membrane=Skin, Mucous Membrane, Serous Membrane B.Connective Membranes=Synovial (areolar connective tissue) that has no Epithelial cells

3 Epithelial Membranes Skin (Integument) Wet Exterior Openings Interior Linings

4 A. Cutaneous/Integument/Skin Waterproof-Stretchable-Washable Self-Repairs: Cuts, Rips, and Burns Electrical Insulation Includes: Sweat and Oil Glands, Hairs, and Nails

5 Functions of the Skin Mechanical DamagePhysical Barrier Chemical DamageAcids and Bases Bacterial Damage Unbroken Surface, Acid Mantle Ultraviolet RadiationMelanin protects from Sun Thermal DamageHeat/Cold/Pain Receptors DesiccationWaterproofing Surfaces Heat Loss/RetentionSkin Capillary Access Urea and Uric Acid Excretion Perspiration Vitamin DSunlight

6 Skin Structure Epidermis A.Stratified Squamous B.Keratinizing (hardening) Dermis A.Dense Connective B.Contains Blood, Sweat, and Oil Glands Hypodermis A.A.K.A Subcuaneous tissue B.Adipose Tissue C.Anchor Skin (E&D) to underlying organs

7 3 Layers-Actual Picture

8 Epidermis-5 Strata (Layers) Corneum Lucidum Granulosum Spinosum Basale *****OUTSIDE THE BODY***** *****DERMIS***** EPIDERMISEPIDERMIS

9 Why can we shave (face/legs) and not bleed? The epidermis is AVASCULAR, meaning it has no blood supply of its own. Most cells produce keratin (tough, fibrous protein) Basale (alive with spino- and granulo-) absorbs nutrients, the top 2 (lucid- and corne-) are non-living

10 Then why do you bleed when you shave? Because you cut too deeply and get into the DERMIS

11 The 5 Strata Layers Corneum:20-30 cells thick Lucidum: dead, clear cells found only on hands/feet Granulosum: still living cells Spinosum:living cells Basale: absorb nutrients from the dermis to keep them alive, and float up to form the above 4 layers

12 New EPIdermis every days Suntans/burns occur in the Basale Melanin (colored pigment) Basale cells phagocytize (eat) the melanin Melanin shields DNA from UV rays

13 The Dermis Divided into 2 Layers- Papillary and Reticular

14 Papillary Layer Upper projections called papillae containing pain and touch receptors (known as Meissners corpuscles)

15 Reticular Layer Contains blood vessels, sweat and oil glands and deep pressure receptors (Pacinian corpusles) Many phagocytes to attack bacteria that has passed through Epi- Collagen fibers and blood vessels


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