GI Histology II Flashcards
Duodenum
Has a wide spatulate or leaflike distal shape
Deeps crypts of of Lieberkuhn
Brunner’s glands with excretory ducts in submucosa
Ileum
Villi narrow and shorter than in jejenum
Crypts of lieberkuhn present
No glands in submucosa
Crypt of Liberukuhn
Simple tubular glands within intestinal mucosa
Open between adjacent villi an extend to muscularis mucosa
What type of cells does crypt of liberukuhn have? (3)
Goblet cells
Enterocytes
Paneth Cells
Paneth Cells
Basal crypt cells
Prominent eosinophilic granules
Produce lysozyme to control intestinal flora
Jejenum
Villi longer and narrow
Crypts of Lieberkuhn present
No glands in submucosa
What does the large intestine do?
Absorption of fluid Secretion of mucus for lubrication Forms fecal mass Continues digestion started by small intestine Plenty of goblet cells here
Glands of Brunner
Forms bicarbonate and duodenum
What are the major structural features that increase surface area for absorption in G.I tract
length of small and large intestine
Pilcae circulares
Villi
Microvilli
Describe histology of crypt-villus system
Core has lamina propria
Crypts extend down between villi below bases of villi
Describe fine structure of microvillus
Covered in glycolipid coat
Describe glycocalyx
Contains array of brush-border enzymes produced by small intestinal epithelial cells( maltase, sucrase, isomaltase, etc..)