GI1 Microanatomy Flashcards
What is the function of the gut?
- absorption of nutrients
- immune function
- excretion
- communication ( enteric NS)
What 2 main groups are present in the GI?
- alimentary canal : where the food goes
2. accessory digestive organs
The 4 layers of the GI tract
- mucosa : inner most what the food touches
- submucosa: (glands, submucosal (meissners) plexus, lymphatics)
- muscularis externa (mooth muscle, inner circular, outer longitudinal, myenteric plexus- large and small intestine)
- meissners (serosa/ loose connective tissue)
What makes up the mucosa layer of the GI?
inner most what the food touches epithelium, laminar propria, muscularis mucosa (circular or spiracle)
What 3 layers are present in the mucosa?
- epithelium
- lamina propria (glands, lymphatics, capillary plexus- large intestine only contains lymphatics)
- muscularis mucosa (smooth muscle- circular or spiral)
State what type of epithelium is present in the following:
- oseophagus
- pyloric spincter
- stomach
- small intestine
- large intestine
- stratified non-keratinesed epithelium
- inner muscularis layer
- simple columnar
- simple columnar with microvilli +goblet cells
- simple columnar + rela. more goblet cells
What cell type is present in the stomach antrum and what does it secrete?
G-cells, gastrin
1) name the organs with 2 layers of muscle in the muscularis externa?
oseophagus, small intestine, large intestine
How many layers of muscles are in the muscularis externa of the stomach ?
3
What cell type is present is mesothelium?
simple squamous epithelium
In the oesophagus, what do the muscularis externa?
peristaltic movement
What glands are present in the following:
- oseophagus
- stomach
- small intestine (duodenum)
- large intestine
- submucosal seromucous glands ( NO gastric glands)
- gastric glands
3 Bunner’s glands (submucosal glands) and mucosal glands in crypts of lieberkuhn - mucosal glands in crypts of lieberkuhn
What is the function of the crypts?
stem cells
What is present in the muscularis externa of the intestine?
Myenteric plexus
What cell types are present in the gastric gland?
- parietal cells
- mucous secreting cells
- chief cells
- enteroendocrine APUD cells