Exam 3 – Lecture 24: GI 3 Flashcards
What are the layers of the small intestine?
Mucosa
Submucosa
Muscularis
Serosa
Describe the mucosa of the small intestine
Columnar epithelium
Brush border (microvilli on the villi)
Lamina propria
What are the 2 layers of muscularis?
Inner circular layer
Longitudinal layer
Where is the inner circular of the muscularis?
Goes around the intestine
Where is the longitudinal layer of the muscularis?
Runs the length of the intestine
What is the serosa of the small intestine also known as?
Visceral peritoneum
Tunica adventitia
What is the serosa of the small intestine?
Simple squamous epithelium on a connective tissue base
What are the villi lengths in the duodenum?
Tall villi
Deep cryptes
What are the villi lengths in the jejunum?
Middle villi
Middle crypts
What are the villi lengths in the ileum?
Sort villi
Shallow crypts
What is the small intestine like in birds?
Have paired ceca
Meckel’s diverticulum
What is meckel’s diverticulum?
Remnant of the umbilical cord in the middle of the intestine
What are the cell types of the small intestine?
Enterocytes Goblet cells Paneth cells Enteroendocrine cells M cells
Describe enterocytes
Enzymes, H2O, absorption
Tight junctions
Brush border
What can be found in the lamina propria of the small intestine
Submucosal glands
Submucosal plexus
Myenteric plexus
GALT