Three stages
Oral stage:
- voluntary,
- closure of mouth,
- cessation of respiration
- raising of larynx
- sudden elevation of the tongue
- press the tongue against the palate,and pushes it backwards towards the oropharynx
Pharyngeal stage :
- Involuntary reflux
- contraction of nasopharynx sphincter,
- larynx rises more
- laryngeal inlet closure
- epiglottis diverts the food into cricopharyngeal sphincter
- contraction of constrictor muscles
- relaxed cricopharyngeal sphincter
Esophageal: