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Stages of Deglutition

📑 5 slides 👁 36 views 📅 3/16/2026
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Introduction to Deglutition

Deglutition is the process of swallowing food or liquid.

Introduction to Deglutition
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Phases of Deglutition

  • Oral phase: Voluntary control, tongue pushes bolus to pharynx.
  • Pharyngeal phase: Involuntary, bolus moves past epiglottis.
  • Esophageal phase: Peristalsis moves bolus to stomach.
Phases of Deglutition
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Neural Control of Swallowing

  • Medulla oblongata houses the swallowing center.
  • Cranial nerves V, VII, IX, X, XII are involved.
  • Sensory input triggers reflexive muscle contractions.
Neural Control of Swallowing
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Clinical Correlations

  • Dysphagia: Difficulty swallowing, common in stroke patients.
  • Aspiration: Food/liquid enters airways, causes pneumonia.
  • GERD: Lower esophageal sphincter dysfunction.
Clinical Correlations
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Summary and Conclusion

  • Deglutition involves oral, pharyngeal, esophageal phases.
  • Neural control is critical for coordinated movements.
  • Disorders can lead to serious health complications.
Summary and Conclusion
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