GI Histology II

Question 1

Duodenum

Answer 1

Has a wide spatulate or leaflike distal shape
Deeps crypts of of Lieberkuhn
Brunner’s glands with excretory ducts in submucosa

Question 2

Ileum

Answer 2

Villi narrow and shorter than in jejenum
Crypts of lieberkuhn present
No glands in submucosa

Question 3

Crypt of Liberukuhn

Answer 3

Simple tubular glands within intestinal mucosa

Open between adjacent villi an extend to muscularis mucosa

Question 4

What type of cells does crypt of liberukuhn have? (3)

Answer 4

Goblet cells
Enterocytes
Paneth Cells

Question 5

Paneth Cells

Answer 5

Basal crypt cells
Prominent eosinophilic granules
Produce lysozyme to control intestinal flora

Question 6

Jejenum

Answer 6

Villi longer and narrow
Crypts of Lieberkuhn present
No glands in submucosa

Question 7

What does the large intestine do?

Answer 7

Absorption of fluid
Secretion of mucus for lubrication
Forms fecal mass
Continues digestion started by small intestine
Plenty of goblet cells here

Question 8

Glands of Brunner

Answer 8

Forms bicarbonate and duodenum

Question 9

What are the major structural features that increase surface area for absorption in G.I tract

Answer 9

length of small and large intestine
Pilcae circulares
Villi
Microvilli

Question 10

Describe histology of crypt-villus system

Answer 10

Core has lamina propria

Crypts extend down between villi below bases of villi

Question 11

Describe fine structure of microvillus

Answer 11

Covered in glycolipid coat

Question 12

Describe glycocalyx

Answer 12

Contains array of brush-border enzymes produced by small intestinal epithelial cells( maltase, sucrase, isomaltase, etc..)