Swallowing Flashcards
What are the 3 stages of swallowing?
Oral
Pharyngeal
Oesophageal
What is the first stage of swallowing?
Oral
How is the oral stage of swallowing divided?
Preparatory phase
Transit phase
Is the oral stage voluntary or involuntary?
Voluntary
What happens in the preparatory phase of the oral stage?
Making bolus
What happens in the transit phase of the oral stage?
Bolus pressed against palate and pushed into oropharynx by tongue and soft palate
What innervates the oral stage?
CN XII - hypoglossal
Innervates muscles of tongue
Is the pharyngeal stage voluntary or involuntary?
Involuntary
What happens in the pharyngeal stage?
Tongue positioned against hard palate
Soft palate elevated sealing off nasopharynx
Suprahyoid and longitudinal muscles shorten
- pharynx widens and shortens
- larynx elevated and sealed off by vocal cords
Epiglottis closes over larynx
Bolus moves through pharynx
Relaxation of upper oesophageal sphincter
What innervates the pharyngeal stage?
CN Vc CN VII CN IX CN X CN XII
Is the oesophageal stage voluntary or involuntary?
Involuntary
What happens in the oesophageal stage?
Food moves into oesophagus
What innervates the oesophageal stage?
CN X
