GI Histology: key facts Flashcards
How much do villi increase surface area?
10x
How much do microvilli increase surface area?
100x
There is a cell in the base of the small intestinal crypts with eosinophilic granules and cytoplasm, what is it?
Paneth cell
What histological feature distinguishes the duodenum?
Submucosal glands (Brunner’s glands)
What Hisological features distinguish the Ileum?
Aggregates of lymphoid follicles
What histological features distinguish the Jejunum?
None, the best way to identify the jejunum is by the absence of other distinguishing features.
What particular cell type is absent from the large intestine that is present higher up in the GI tract (Herron emphasized!)?
Paneth cells
You see a slide of GI tract with small lumen and a ring of lymph nodules in the lamina propria?
Appendix
You see a circle around the structures of the portal triad. What do you call it?
Portal canal!!!
Do not call it the portal triad.
What proportion of the liver is composed of hepatocytes?
80%
What are Ito cells?
Ito cells aka stellate cells are scattered throughout the Liver. They store vitamin A
What is the space of Disse?
The space between the sinusoidal endothelium and the hepatocytes in the liver.
What is the pathway of bile flow?
canaliculi –> Canal of Herring –> Interlobular duct –> R or L Hepatic duct
What is the composition of bile?
Lecithin, Bile salts
Na+, K+, Ca, Cl-, HCO3-
Bile pigments
What is the pathway of the Exocrine pancreas?
Acini –> Intercalated –> Intralobular –> Interlobular –> Man pancreatic duct
