gi tract Flashcards
4 layers of GI tract
- mucosa
- submucosa
- muscularis propria
- adventitia
layers of the mucosa
- epithelium
- lamina prorpia
- muscularis mucosa
muscularis mucosa
separates the lamina propria from submucosa
muscularis propria
- smooth muscle
- inner circular, outer longitudinal
what is found between the two layers of muscle in muscularis propria
myenteric nerve plexus
type of epi in mucosa of esophagus
NK SSE
what is found in submucosa of esophagus
mucous glands
upper 1/3 of esophagus is lined with what type of muscle
skeletal
where is SEROSA (peritoneum) present in esophagus
peritoneal cavity near the gastroesophageal junction
three zones of the stomach
- cardia
- fundus and body
- pyloric antrum
what type of epi is seen in the stomach
simple columnar epithelium
3 layers of muscularis externa
- inner oblique
- middle circular
- outer longitudinal
glands seen in cardia region of stomach
cardiac mucous glands
what do cardiac mucous glands secrete
mucous and lysozyme
parietal cells secrete
HCl and intrinsic factor
chief cells secrete
pepsinogen
where do chief cells predominate
lower part of mucosa
where do parietal cells predominate
middle part of mucosa
where do mucous cells and gastric pits predominate
upper part of mucosa
purple with basal nucleus
chief cells
fried egg, pink cytoplasm
parietal cell
what type of granules do chief cells secrete
zymogen granules
pyloric antrum
- long gastric pits
- mucous cells
- neuroendo cells (G cells): secrete gastrin
jejunum has transverse folds called
plicae circulares
glands between bases of villi
crypts of lieberkuhn
lymphoid aggregates in lamina propria called
peyer’s patches
where are peyer’s patches found
terminal ileum
neuroendocrine cells of small intestine secrete
- secretin
- cholecystokinin (CCK)
- gastric inhibitory peptide
paneth cell of small intestine (often in crypts )
-secrete lysozyme and glycoproteins
glands in duodenum
brunner’s glands
identifying a paneth cell
granules are towards lumen
*pink
identifying a neuroendo cell
granules beneath nucleus, away from lumen
*purple
the mucosa of large intestine has a ____ appearance
test tube
- no villi
- lots of goblet cells
prominent structure of appendix
lymphoid follicles
what is required for the follicle
germinal center
