Action (general)

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Action (general): Elevate the hyoid bone, which then elevates the tongue and the larynx during swallowing.

Digastrics in particular aid in depression of the mandible

Model for actions of soft palate and pharynx during breathing and eating

Deglutition (act of swallowing) - is a complex series of muscle actions that transfers the food bolus from the mouth through the pharynx and into the esophagus.

3 phases

1. Oral phase – (voluntary) bolus compressed against the palate and moved to the oropharynx

• Produced by actions of the tongue, raise and retracted (styloglossus)

• The tongue is stabilized by the anchoring action to the hyoid (digastric and mylohyoid)

• Oral cavity is closed off from pharynx by palatoglossal and palatopharyngeal muscles
2. Pharyngeal phase – Food bolus is moved through the pharynx (breathing and chewing stop)

• Close off the nasopharynx by elevating the soft palate (tensor and levator veli palatini)

Elevate and widen pharynx which aids in elevation of larynx (stylopharyngeus, palatopharyngeus, and salpingopharyngeus)

• Elevate the hyoid (and therefore the larynx) (stylohyoid and digastrics)

• Elevating the larynx deflects the epiglottis effectively “closing” the laryngeal inlet

• Arytenoid cartilages adducted

3. Esophageal phase (involuntary)- Food bolus is moved to esophagus

• Mainly action of pharyngeal constrictors

• Inferior constrictor forces food bolus into esophagus

• Return larynx to original position (infrahyoid muscles)

• Lower tongue in oral cavity (hyoglossus and genioglossus)
Breathing with food in oral cavity


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