Digestive System: Oral Cavity

by Geoffrey Meyer, PhD

Questions about the lecture
My Notes
  • Required.
Save Cancel
    Learning Material 2
    • PDF
      Slides 12 Human Organ Systems Meyer.pdf
    • PDF
      Download Lecture Overview
    Report mistake
    In this lecture, you are going to learn the histology of important structures in the oral cavity that have a role in the digestive system. At the end of this lecture, it's important that you understand the structure of oral mucosa and also the structure of the tongue, particularly, the papillae on the dorsal surface of the tongue, and also these taste buds, and the role of the taste bud in detecting taste. And then we're going to look at the differences in the salivary glands, the three major salivary glands: the parotid, the sublingual, and the submandibular gland. And finally, we will have a look at the structure of the tooth. All these structures in the oral cavity are very important because they break down the food mechanically. The secretions from the salivary glands moisten the food and then form a bolus, which enables the food to then pass easily down the esophagus into the stomach. The tongue is a very important organ, not just for speech and taste, but it acts as a shovel in the oral cavity and helps also break down the food by pushing it up against the hard palate, the masticatory mucosa. And the teeth, of course, are important structures in the oral cavity because they also mechanically break down the food into smaller components that again can be passed easily down the esophagus in the bolus of food. Here on this slide, there is three images for you to get an orientation of the oral cavity. On the left-hand side, you can see a midsagittal section taken through the head, and it shows the region of the oral cavity. You can see the lip labelled, the tooth labelled, and the tongue. So just orientate yourself now as to what structures, what major structures...

    About the Lecture

    The lecture Digestive System: Oral Cavity by Geoffrey Meyer, PhD is from the course Gastrointestinal Histology. It contains the following chapters:

    • Digestive System: Oral Cavity
    • Lip
    • Hard palate
    • Salivary glands
    • Tongue
    • Tooth
    • Enamel, dentin and cementum
    • Supporting structures of the tooth
    • Summary of the oral cavity

    Included Quiz Questions

    1. Labial glands are located under the oral mucosa and the epithelial surface of the vermillion border.
    2. The orbicularis muscle is involved with moving the lips.
    3. The epithelium of the oral mucosa is stratified squamous epithelium.
    4. The vermillion border is at the junction of the skin surface of the lip and the oral mucosa.
    5. The skin epithelium on the lip has a much thinner epithelium than that of the oral mucosa.
    1. Masticatory mucosa is loosely bound to the bone of the hard palate by collagen fibres.
    2. The tooth is embedded in alveolar bone.
    3. Masticatory mucosa is usually stratified squamous epithelium but can also be slightly keratinized in areas of constant wear and tear.
    4. Swell bodies in conchae in the nasal cavity assist to warm, moisten and clean inhaled air.
    5. Many glands secrete substances into the oral cavity to assist in the formation of a food bolus.
    1. Secretions pass from the secretory acinus into the striated duct then into intercalated ducts.
    2. Secretory units can be either serous or mucous secreting units.
    3. Myoepithelial cells surround both the duct and the secretory units.
    4. Myoepithelial cells help movement of the secretory products into the luminal space within the acinus.
    5. Myoepithelial cells are contractile.
    1. Both the parotid gland and the sublingual gland contain serous-secreting units.
    2. The parotid gland and the submandibular gland contain serous-secreting units.
    3. The sublingual gland and the submandibular gland contain mucous-secreting units.
    4. The parotid gland contains serous-secreting units.
    5. The sublingual gland contains mucous-secreting units.
    1. Both the sublingual gland and the submandibular gland contain prominent intercalated and striated ducts.
    2. Intercalated and striated ducts help to modify the secretion products of the acinar cells in serous secreting glands.
    3. Striated ducts contain abundant mitochondria within numerous basal folds at the basal surface of the epithelial cells of the duct.
    4. The parotid gland and the pancreas contain prominent intercalated and striated ducts.
    5. The parotid gland and the pancreas secrete a serous type fluid.
    1. The tongue has abundant bundles of smooth muscle supported by collagenous connective tissue.
    2. Filiform papillae enable the tongue to manipulate food up against the hard palate.
    3. Circumvallate papillae have taste buds.
    4. Fungiform papillae have taste buds.
    5. Papillae are located on the dorsal surface of the tongue.
    1. The clinical crown of the tooth is the whole enamel surface both exposed and also embedded (covered) by the gingiva.
    2. The pulp cavity is continuous with the root canal.
    3. The tooth is supported in its bony socket in the alveolar bone by the periodontal ligament.
    4. Stria (lines) in the tooth enamel reflect developmental increments.
    5. The anatomical crown of the tooth is the whole enamel surface exposed both above and below the gingiva.
    1. The periodontal ligament holds the tooth in its socket by its attachment to the epithelial attachment region of the enamel.
    2. The periodontal ligament plays a role in tooth eruption.
    3. The periodontal ligament detects proprioceptive information.
    4. The periodontal ligament can be affected structurally by dietary deficiencies.
    5. The periodontal ligament can influences the remodelling of bone as a reaction to different stresses.

    Author of lecture Digestive System: Oral Cavity

     Geoffrey Meyer, PhD

    Geoffrey Meyer, PhD

    Customer reviews

    5,0 of 5 stars
    5 Stars
    4 Stars
    3 Stars
    2 Stars
    1  Star