SKIN and BODY MEMBRANES

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CHAPTER 4

• SKIN and BODY MEMBRANES

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BODY MEMBRANES

• Defined as the outermost edge, where tissue
  interacts with the environment.
• Environment could be the atmosphere, ingested
  food or a body cavity.

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BODY MEMBRANES (functions)

• cover surfaces
• -line body cavities
• -form protective sheets around organs
• - often lubricate organs

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BODY MEMBRANES

• 2 TYPES OF BODY MEMBRANES (described by tissue
  make up)
• 1. EPITHELIAL MEMBRANES
• 2. CONNECTIVE TISSUE MEMBRANES

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EPITHELIAL MEMBRANES (3)

• 1. CUTANEOUS MEMBRANE- location- SKIN-
• Characteristics-
• Superficial EPIDERMIS is composed of a
  keratinized stratified squamous epithelium.
• Underlying DERMIS is composed of dense (fibrous)
  connective tissue.
• THIS IS THE ONLY DRY EPITHELIAL MEMBRANE.

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EPITHELIAL MEMBRANES (3)

• MUCOUS MEMBRANES- (mucosa)-location- This
  membrane lines all the body cavities that are
  open to the exterior. (respiratory, digestive,
  urinary)
• Characteristics- various epithelium (simple
  squamous, cuboidal, columnar) resting on LAMINA
  PROPRIA which is some a loose connective tissue.
• Epithelium of mucosae is adapted for absorption
  or secretion. Most secrete mucus (except for
  lining of urinary tract) and are considered WET
  MEMBRANES.

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EPITHELIAL MEMBRANES
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EPITHELIAL MEMBRANES (3)

• 3. SEROUS MEMBRANES- (serosa)-location line
  body cavities that are closed to the exterior
• Characteristics- layer of simple squamous
  epithelium resting on a thin layer of areolar
  connective tissue
• Serosa produces SEROSA FLUID a clear fluid
  which allows organs to slide easily across the
  cavity walls and other organs because they produce

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SEROUS MEMBRANES
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SEROUS MEMBRANES-

• Serous membranes occur in pairs
• PARIETAL LAYER lines the walls of the body
  cavities
• VISCERAL LAYER- covers the organs

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SEROUS MEMBRANES-

• IDENTIFIED BY LOCATION-
• PLEURA- serosa found around the lungs
• PERICARDIUM- serosa around the heart
• PERITONEUM- serosa around the abdominal cavity

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SEROUS MEMBRANES-

• QUIZ TIME
• 1. Parietal pleura-
• 2. Visceral pleura-
• 3. Parietal peritoneum-
• 4. Visceral peritoneum-
• 5. Parietal pericardium-
• 6. Visceral pericardium-

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CONNECTIVE TISSUE MEMBRANES (1)

• SYNOVIAL MEMRANES- location- synovial joints-
  nearly all movable joint- knee, elbow, etc
• Characteristics- made of soft areolar connective
  tissue
• Provide a smooth surface and secrete lubricating
  synovial fluids

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SYNOVIAL MEMBRANE
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SYNOVIAL MEMBRANE