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DYSPHAGIA-PHASES OF SWALLOWING

Neurology

DYSPHAGIA-PHASES OF SWALLOWING

1. ORAL PREPARATORY PHASE - voluntary preparation of food; rotatory jaw movement with lateral tongue movement to position food between the teeth.

2. ORAL PHASE - voluntary phase; AP tongue movement to propel food to thepharynx; soft palate elevation & velopharyngeal port closure to close off the nasal cavity and prevent regurgitation.

3. PHARYNGEAL PHASE - reflex phase; aspiration most likely to occur during this phase; soft palate elevation & velopharyngeal port closure; pharyngeal constriction & cricopharyngeal relaxation to facilitate bolus transport into the oesophagus.

4. OESOPHAGEAL PHASE - reflex phase; oesophageal clearance occurs by gravity but requires coordinated peristalsis & relaxation of the gastrooesophageal sphincter.


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REFERENCES

1. Wilkinson, I. (2017). Oxford handbook of clinical medicine. Oxford: Oxford University Press.
2. Hannaman, R. A., Bullock, L., Hatchell, C. A., & Yoffe, M. (2016). Internal medicine review core curriculum, 2017-2018. CO Springs, CO: MedStudy.
3. Image: no reference available.

Ⓒ A. Manickam 2018

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