oesophagus and stomach Flashcards Preview

LSS Alimentary System > oesophagus and stomach > Flashcards

Flashcards in oesophagus and stomach Deck (7)
Loading flashcards...
1
Q

what two sections is the lower oesophageal sphincter split into

A

internal component, external component

2
Q

what is the internal component built into

A

circular smooth muscle of oesophageal wall

3
Q

what is the external component formed by

A

right crus of diaphragm

4
Q

what type of control is the right crus of diaphragm under

A

voluntary control

5
Q

functions of lower oesophageal sphincter

A

allow movement of food and fluid into stomach, ensure acidic contents of stomach remain separate from vulnerable oesophageal tissue

6
Q

what is z-line

A

visible threshold between epithelia of oesophagus and stomach

7
Q

what prevents reflux and impact of pregnancy

A

diaphragm acting on lower oesophageal sphincter (can fail during pregnancy as foetus pushes stomach upwards, so sphincter pushed higher up into thorax and as negative pressure acid moves up