7 Histo of the SI + LI Flashcards
Where a GI organ is covered in peritoneum, the outermost layer is called
Serosa
The small intestine is characterized by what kind of crypts
Lieberkuhn
What are the ways in which the SI functions to increase SA
Vili
Plica circularis (similar to rugae)
Microvilli (only found in SI)
What does the villus capillary plexus of the SI supply
Intestinal villus and upper portion of crypts of lieberkuhn
What does the pericryptal capillary plexus supply in the SI
Lower half of crypts of liberkuhn
What do lacteals do
They are lymphatic vessels that can form GALT and function to transport fats
Where is the plexus of meissner
Submucosa layer
Where is the myenteric plexus of auerbach
In between the inner circular muscularis layer and the outer longitudinal layer
What glands are characteristic of the duodenum
Brunner’s glands in the submucosa
What do bruner’s glands do
Produce an alkaline secretion to neutralize acidic stomach contents
What is a major characteristic of the gastroduodenal junction
Thick wall of muscle at the pyloric sphincter
Deep glands can be found in the duodenum
What does the jejunum’s villi look like
They are longer than the ileum and they have developed lacteals underneath
What is the difference between the jejunum and the duodenum
The jejunum lacks Brunner’s glands
What does the jejunum not have that the ileum has
Peyer’s patches (developed lymph nodules)
How do the villi of the jejunum and the ileum compare
Ileum has shorter and less plentiful villi
What parts of the GI have paneth cells
Ileum and jejunum
Where are paneth cells found in the ileum
Base of the crypts of lieberkuhn
