Digestive tract wall anatomy Flashcards
What are the layers of the gut wall?
MSMS
Mucosa
Submucosa
Muscularis externa
Serosa/adventitia
What does the mucosa of the gut wall exist of?
epithelium, lamina propria, muscularis mucosa
where is the Meissner nerve plexus?
submucosa
what plexus is in the submucosa of the gut wall?
submucosal nerve plexus
what is the role of the submucosa?
secretion of fluids
which gut wall layer secretes fluid?
submucosa
which plexus does the muscularis externa contain?
myenteric nerve plexus (Auerbach)
submucosal nerve plexus: name?
Meissner
myenteric nerve plexus: name?
Auerbach
what is the role of the muscularis externa layer?
motility
which part of the gut wall is responsible for motility?
muscularis externa
when do you call the outer layer ‘serosa’?
when it’s intraperitoneal
when do you call the outer layer ‘adventitia’?
when it’s retroperitoneal
serosa: intra- or retroperitoneal?
intra
adventitia: intra- or retroperitoneal?
retro
ulcers can extent into which layer?
muscularis externa, into the outer muscle layer
erosions are in which layer only?
mucosa
muscularis externa: consists of which layer?
inner circular layer
myenteric nerve plexus (auerbach)
outer longitudinal later
inner layer of the muscularis externa: circular or longitudinal?
circular
outer layer of the muscularis externa: circular or longitudinal?
longitudinal
where does the basal electric rythm (slow waves) originate from?
(‘pacemaker cells’)
interstitial cells of Cajal
interstitial cells of Cajal: role?
‘pacemaker cells in the gut’
produce basal electric rythm (slow waves)
where are the interstitial cells of cajal located?
circular layer in the muscularis externa
highest frequency Cajal cells?
duodenum
lowest frequency Cajal cells?
stomach
frequency Cajal cells:
duodenum
stomach
ileum
order from high to low
duodenum>ileum>stomach
gut wall layers: mnemonic?
MSMS
