Swallowing

Question 1

What are the 3 stages of swallowing?

Answer 1

Oral
Pharyngeal
Oesophageal

Question 2

What is the first stage of swallowing?

Answer 2

Oral

Question 3

How is the oral stage of swallowing divided?

Answer 3

Preparatory phase

Transit phase

Question 4

Is the oral stage voluntary or involuntary?

Answer 4

Voluntary

Question 5

What happens in the preparatory phase of the oral stage?

Answer 5

Making bolus

Question 6

What happens in the transit phase of the oral stage?

Answer 6

Bolus pressed against palate and pushed into oropharynx by tongue and soft palate

Question 7

What innervates the oral stage?

Answer 7

CN XII - hypoglossal

Innervates muscles of tongue

Question 8

Is the pharyngeal stage voluntary or involuntary?

Answer 8

Involuntary

Question 9

What happens in the pharyngeal stage?

Answer 9

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

Question 10

What innervates the pharyngeal stage?

Answer 10

CN Vc
CN VII 
CN IX 
CN X
CN XII

Question 11

Is the oesophageal stage voluntary or involuntary?

Answer 11

Involuntary

Question 12

What happens in the oesophageal stage?

Answer 12

Food moves into oesophagus

Question 13

What innervates the oesophageal stage?

Answer 13

CN X