jejunum Flashcards
1
Q
how many parts of the intestine are jejunum?
A
the 2/5ths of the proximal part
2
Q
what are the characteristics of the jejunum?
A
- larger in diameter
- thicker
- less prominent arterial arcades
- longer vasa recta
- prominent pliae circulares
3
Q
what is pliae circularis?
A
invagination of the mucosa and submucosa
4
Q
what causes the unique shape of vili?
A
the projections of lamina propria that causes the epithelium to change shape
5
Q
what is the lymphatic vessel of the lamina propria called?
A
the lacteal
6
Q
what is an invagination into the mucosa called?
A
the crypt of Lieberkuhn?
7
Q
what lines the crypt of Lieberkuhn?
A
simple columnar, goblet, enteroendocrine, and paneth cells
8
Q
what do paneth cells do?
A
secreting alpha defensins to help with microbial defense
9
Q
what do you call the patches at the distal jejunum area?
A
peyer’s patches
10
Q
what do the patches at the distal jejunal area do?
A
immune system
