Ch. 4 Skin and Body Membranes Part 1 Mrs. Barnes AP.
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Transcript of Ch. 4 Skin and Body Membranes Part 1 Mrs. Barnes AP.
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Ch. 4 Skin and Body Membranes
Part 1Mrs. Barnes
A&P
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Body MembranesTwo Classifications
Epithelial Membranes (3)Connective Membranes (1)
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Body MembranesEpithelial Membranes- covering and lining
membranesCutaneous (Skin or Integumentary System)MucousSerous
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Epithelial MembranesCutaneous Membrane- Known as the skin. The superficial epidermis is composed of
keratinizing stratified squamous epithelium.
What does keratinizing mean?Unlike the others, this is a dry membrane.
What does this mean?
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Epithelial MembranesMucous Membrane- composed of epithelium
resting on Lamina Propria
Lines all body cavities that open to the exterior (Ex. Respiratory, Digestive, Urinary and Reproductive)
Tissue makeup varies. Mucosa refers only to the location of the epithelial membranes.
These are “wet” or moist membranes.
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Epithelial MembranesSerous Membranes- composed of layer of simple
squamous epithelium resting on a thin layer of areolar connective tissue.
Line body cavities that are closed to the exteriorOccur in pairs (Ex. Parietal and _________?)
Balloon and Fist ExampleVisceral is touching organ. Parietal on the outside
What is in between the two layers?
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Epithelial Membranes Membranes surrounding:
Abdominal cavity- Peritoneum (P and V)Lungs- Pleura (P and V)Heart- Pericardium (P and V)
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Connective MembranesSynovial membranes- composed of soft areolar
connective tissue and contain no epithelial cells at all.
Line the fibrous capsules surrounding joints. Provides a smooth surface and secrete a lubricating fluid.
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Integumentary SystemCutaneous Membrane- just skinIntegumentary System includes skin and it’s
derivatives (sweat and oils glands, hair, and nails).
Integument- means “covering”
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Integumentary System“Without our skin we would fall prey to bacteria
and perish from water and heat loss”Functions of:
Protection (mechanical, chemical, thermal, UV radiation, and bacteria)
InsulationCushion
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Integumentary SystemThe Skin-
Uppermost layer-full of keratin and is cornified (hardened)- prevents water loss from body surface.
Two Layers– EpidermisDermis
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Integumentary SystemEpidermis- made of stratified squamous
epithelium. Capable of keratinizing or becominghard and tough
Dermis- made of mostly dense connective tissue.
Epidermis and Dermis are firmly connected What can happen if they separate?
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Integumentary SystemSubcutaneous tissue (hypodermis)- Deep to the
dermis. Essentially adipose tissue. Anchors the skin to underlying organs and
provides site for fat storage. Also, a shock absorber and insulator
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EpidermisComposed of 5 layers (or Strata)
Stratum Basale- Deepest Layer and Most Nourished
Spinosum- 2nd deepestGranulosum- 3rd deepestLucidum Corneum
Epidermis is Avascular- Is this a good thing? Think about when you shave?
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British and Spanish Grannies Like CornflakesRemember: Basale = Bottom
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EpidermisMost cells in the epidermis are keratinocytes
What do these cells do?All layers are present in Fig. 4.4 except the
Stratum Lucidum. This tissue appears clear and not present in all skin regions
Found in hairless and extra thick regions (Ex. Palms of the hands and soles of the feet).
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EpidermisStratum Corneum- Outermost layer
20-30 cell layers thick but accounts for ¾ of the epidermal thickness.
The average person sheds about 40lbs of “flakes” in a lifetime. This is what the dust mites eat.
We have a “new” epidermis every 25 to 45 days.
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EpidermisMelanin- pigment that ranges in colors
Yellow to Brown to Black
Produced by spider-shaped cells called Melanocytes
When the skin is exposed to sun, the melanocytes are stimulated to produce more melanin pigment
aka tanning occurs
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EpidermisFreckles and Moles- where there is a
concentrated amount of Melanin
Epidermal Dendritic CellsMerkel Cells
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DermisThis is your “hide”- strong, stretchy and binds
your body together. 2 Major Regions:
PapillaryReticular
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DermisPapillary Layer
Upper dermal region- p 117Uneven and peglike projections called Dermal
PapillaeContain capillary loops which furnish nutrients to
epidermis. House pain receptors (free nerve endings) and touch
receptors
Fingerprints- Sweat films??
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DermisReticular Layer-
Deepest skin layer Irregularly arranged connective tissue fibers, blood
vessels, sweat and oil glands, and deep pressure receptors.
Phagocytes are found here. Why? What do Phagocytes do?
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DermisCollagen and Elastic Fibers found in DermisCollagen keeps skin tough and attract and bind
to water. This keeps the skin hydrated.Elastic fibers give skin its elasticity when we are
young. As we age the number of fibers decrease.
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DermisHas lots of blood vessels! Plays a role in
maintaining body temperature.
When the body temp is high- capillaries _________.
When the body temp is low- capillaries __________.
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DermisSkin ulcers- Decubitus ulcers- Bed sores p117