Oral Biology: Salivary Gland Structure & Function
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Questions and Answers

What type of tissue supports the epithelial component in salivary glands?

  • Nervous tissue
  • Epithelial tissue
  • Muscle tissue
  • Connective tissue (correct)
  • What is the function of serous cells in salivary glands?

  • To produce thin, watery and proteinaceous secretion (correct)
  • To regulate blood pressure
  • To produce mucous
  • To produce hormones
  • What is the shape of serous cells under light microscopy?

  • Spherical
  • Fibroblast
  • Pyramidal (correct)
  • Cuboidal
  • What is the location of the nucleus in serous cells?

    <p>Basally</p> Signup and view all the answers

    What is the function of the duct system in salivary glands?

    <p>To transport saliva</p> Signup and view all the answers

    What is the characteristic of the cytoplasm of serous cells under light microscopy?

    <p>Stained intensely with H &amp; E</p> Signup and view all the answers

    What is the characteristic of the Golgi complex in serous cells under electron microscopy?

    <p>Located just apical or lateral to the nucleus</p> Signup and view all the answers

    What is the purpose of desmosomes in myoepithelial cells?

    <p>To provide structural stability</p> Signup and view all the answers

    What is the term given to myoepithelial cells due to their unique shape?

    <p>Basket cells</p> Signup and view all the answers

    What is the function of the ductal system?

    <p>To produce and modify saliva</p> Signup and view all the answers

    What type of cells line the intercalated ducts?

    <p>Low cuboidal cells</p> Signup and view all the answers

    What is characteristic of striated ducts under electron microscopy?

    <p>Prominent striations at the basal part of cells</p> Signup and view all the answers

    What is the shape of the nucleus in intercalated ducts?

    <p>Central and round</p> Signup and view all the answers

    What is found in the basal cytoplasm of intercalated duct cells?

    <p>A small amount of rER</p> Signup and view all the answers

    What is the function of the striated duct in terms of secretion and reabsorption?

    <p>Reabsorb sodium and chloride, secrete potassium and bicarbonate ions</p> Signup and view all the answers

    Where are the terminal excretory ducts located?

    <p>In the connective tissue septa</p> Signup and view all the answers

    What type of cells are found in the terminal excretory ducts?

    <p>Pseudostratified tall columnar cells</p> Signup and view all the answers

    What is the function of the Von Ebner gland?

    <p>To wash out the trough of papillae and ready the taste receptors for a new taste stimulus</p> Signup and view all the answers

    Where is the Von Ebner gland located?

    <p>Between muscle fibers, below the circumvallate and foliate papillae</p> Signup and view all the answers

    What type of epithelium is found in the terminal excretory ducts and excretory ducts?

    <p>Pseudostratified or stratified epithelium</p> Signup and view all the answers

    What is the characteristic of the epithelial cells in the striated duct?

    <p>Microvilli on the luminal surface</p> Signup and view all the answers

    What is the primary function of amylase in saliva?

    <p>Breaking down carbohydrates into glucose and maltose</p> Signup and view all the answers

    What is the percentage of water in saliva?

    <p>99%</p> Signup and view all the answers

    Which gland secretes the most saliva?

    <p>Submandibular gland</p> Signup and view all the answers

    What is the role of lingual lipase in saliva?

    <p>Breaking down fats</p> Signup and view all the answers

    What is the function of saliva in temperature regulation?

    <p>Regulating body temperature in animals</p> Signup and view all the answers

    What is the purpose of the duct in Weber glands?

    <p>Secretion of saliva into the lingual crypts</p> Signup and view all the answers

    What is the main component of inorganic substances in saliva?

    <p>Sodium and chloride</p> Signup and view all the answers

    What is the role of saliva in oral tissue maintenance?

    <p>Moistening and lubricating oral tissues</p> Signup and view all the answers

    Which gland is associated with lingual tonsils?

    <p>Weber gland</p> Signup and view all the answers

    What is the role of saliva in digestion?

    <p>Breaking down carbohydrates into glucose and maltose</p> Signup and view all the answers

    What is the characteristic shape of mucous cells under a light microscope?

    <p>Triangular or pyramidal</p> Signup and view all the answers

    What is the characteristic feature of the nucleus in mucous cells?

    <p>Flattened and basally placed</p> Signup and view all the answers

    What is the purpose of Mucicarmine stain?

    <p>To stain mucins in secretory material</p> Signup and view all the answers

    What is the characteristic feature of secretory granules in mucous cells?

    <p>Large and irregular</p> Signup and view all the answers

    Where are myoepithelial cells located?

    <p>Basal to the secretory or duct cells</p> Signup and view all the answers

    What is the characteristic shape of myoepithelial cells?

    <p>Stellate or spiderlike</p> Signup and view all the answers

    What is the function of myoepithelial cells?

    <p>To contract and help in secretion</p> Signup and view all the answers

    Study Notes

    Salivary Glands

    • Composed of epithelial (parenchyma) and connective tissue components

    Secretory Units

    • Consist of serous, mucous, and myoepithelial cells
    • Serous cells:
      • Secretion: thin, watery, and proteinaceous
      • Shape: pyramidal
      • Nucleus: spherical and basally located
      • Cytoplasm: intensely stained with H&E
      • Contain numerous secretory granules
    • Mucous cells:
      • Shape: triangular or pyramidal
      • Nucleus: flattened and basally placed
      • Cytoplasm: washed-out in routine H&E sections
      • Contain numerous granules containing mucins
    • Myoepithelial cells:
      • Contractile cells associated with secretory end piece and intercalated duct
      • Derived from epithelium
      • Stellate shaped or spiderlike shape
      • Scanty perinuclear cytoplasm

    Ductal System

    • Consists of intercalated ducts, striated ducts, and terminal excretory ducts
    • Intercalated ducts:
      • Lined by a single layer of low cuboidal cells
      • Contain a few secretory granules
      • Round or oval centrally placed nucleus
      • Small amount of RER in basal cytoplasm
    • Striated ducts:
      • Lined by columnar cells
      • Central placed nucleus
      • Pale, acidophilic cytoplasm
      • Electron microscopy: prominent striations at basal part of cells
      • Numerous elongated mitochondria in narrow cytoplasmic region
    • Terminal excretory ducts:
      • Located in connective tissue septa
      • Larger in diameter than striated ducts
      • Pseudostratified tall columnar cells admixed with small basal cells and goblet cells

    Lingual Glands

    • Anterior lingual glands: Blandin-Nuhn
    • Posterior lingual glands: Von Ebner gland and Weber gland
    • Von Ebner gland:
      • Location: between muscle fibers, below circumvallate and foliate papillae
      • Function: washing out the trough of papillae and readying taste receptors for a new taste stimulus
    • Weber glands:
      • Location: posterior one-third of tongue, post to sulcus terminalis in association with lingual tonsils
      • Duct: dorsal surface of tongue through the lingual crypts

    Composition of Saliva

    • 99% water and 1% organic and inorganic substances
    • Organic substances: proteins, enzymes, mucins, and antibacterial substances
    • Inorganic substances: sodium, chloride, bicarbonate, and small amounts of calcium, magnesium, phosphate, iodine, thiocyanate, and fluoride

    Functions of Saliva

    • Digestion of food
    • Moistening and lubrication of oral tissues
    • Role in speech
    • Temperature regulation in animals

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    Description

    This quiz covers the structure and function of salivary glands, including the epithelial and connective tissue components, secretory units, and duct system. Learn about serous cells, mucous cells, and myoepithelial cells, and how they contribute to salivary gland function.

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