Oral cavity

  • Created by: saoirselb
  • Created on: 06-11-19 11:49
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  • Oral cavity
    • Functions
      • Digestion
        • Receives food, prepares it for digestion in stomach and small intestine
      • Communication
        • Modifies sound produced in larynx to create a range of sounds
      • Breathing
        • Acts as an air inlet to the nasal cavity
    • Divisions
      • Vestibule
        • Space between lips/cheeks and gums/teeth
        • Opposite the second molar tooth, the parotid gland opens into the vestibule, secreting salivary juices
      • Mouth cavity proper
        • Bordered by roof and floor of mouth as well as cheeks
        • Tongue fills a large proportion of the cavity
    • Roof of mouth
      • Hard palate
        • Found anteriorly
        • Bony plate that separates nasal cavity from oral cavity
        • Covered superiorly by respiratory mucosa and inferiorly by oral mucosa
      • Soft palate
        • Posterior continuation of hard palate
        • Muscular structure
        • Acts as valve that can lower to close the oropharyngeal ithmus and elevate to separate the nasopharynx from oropharynx
    • Floor of oral cavity consists of:
      • Muscular diaphragm
        • Comprised of bilateral mylohyoid muscles
        • Provides structural support to floor of mouth
        • Pulls larynx forward when swallowing
      • Geniohyoid muscles
        • Pull larynx forwards during swallowing
      • Tongue
        • Connected to floor by the frenulum of the tongue (a fold of oral mucosa)
      • Salivary glands and ducts
    • Cheeks
      • Formed by buccinator muscle
        • Contracts to keep food between the teeth when chewing
        • Innervated by buccal branches of the facial nerve (CN VII)
      • Lined internally by oral mucous membrane
    • Innervation
      • Sensory innervation supplied by branches of trigeminal nerve (CN V)
      • Hard palate
        • Innervated by greater palatine and nasopalatine nerves - branches of maxillary nerve (CN V2)
      • Soft palate
        • innervated bt lesser palatine nerve (another branch of maxillary)
      • Floor of cavity innervated by lingual nerve (branch of mandivular (V3) division of trigeminal nerve
      • Tongue
        • innervated by special sensory fibres for taste from chorda tympani, branch of facial nerve (CN VII)
    • Gag reflex
      • Protective against foreign bodies touching posterior aspects of oral cavity
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