Small And Large Intestine Histology Flashcards
What are the two parts of the small intestine that do not contain plicae circularis?
Proximal duodenum & Distal Ileum
Where are the Villi longest and where are the the shortest?
1) Longest: Duodenum
2) Shortest: Ileum
Where are Brunner’s Glands located?
Only in the duodenum; in the submucosa
Where are the Peyer’s Patches most prominent?
Ileum
Plicae Circularis are most prominent and numerous where?
Jejunum and Proximal Ileum
What are two distinct histologicla characteristics of the duodenum?
1) Villi with a leaflike shape
2) Brunner’s Glands (White center, numerous, tubular, colied glands)
What are two distinic histoligcal characteristics of the Jejunum?
1) Villi have a finger-like shape
2) Plicae Circularis are well developed
What are three distinct histological characteristics of the Ileum?
1) Shorter villi than the Jejunum
2) Location of M Cells
3) Peyer’s Patches
What Cell type are the Large Intestines lacking?
Paneth Cells
What are some histological characteristics of the Veriform Appendix?
1) Abudant Lymphoid Follices
2) No Villi
3) Shallow Crypts
4) Tubular glands are lined abdudantly via the Goblet Cells
From what structure is the internal Anal Sphincter composed?
Thickening of the circular inner layer of the muscularis mucosae
From what structures if the external anal sphincter composed?
- it is composed via skeletal muscle (voluntary control)
Which segments have the highest exposure for developing an onset of Celiac’s Disease?
Duodenum and Proximal Jejunum
What are the histological changes associated with Celiac’s Disease?
1) Villus Atrophy
2) Elongated Crypts
3) Plasma Cells in the Lamina Propria
4) T Lymphocytes in the Surface Epithelium
What is the mechanism for which Celiac’s Disease can cause Dermatitis Herpetiforms?
1) IgA Abs react with the Gluten and cross react with Reticulin
B) Reticulin helps anchor the epidermal basement membrane to the superficial dermis
