Preparatory and Oral Phase

• voluntary phase

1. solid mastication (lip closure)

2. saliva mixes with food bolus; tongue and facial muscles prevent bolus from falling into lateral sulci

3. food bolus molded by tongue and teeth (ends Preparatory Phase) and forced to the dorsum of the tongue

4. anterior tongue and base of tongue elevate to contact palate, posterior pharyngeal wall, and floor of mouth; hyoid bone slowly elevates

5. food bolus propelled into oropharynx (up to vallecula)

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