Highison: Stomach Flashcards
Discuss the anatomy of the stomach.
Esophagus–>cardia–>fundus–>body–>pyloric antrum–>pyloric canal–>pylorus–>duodenum
4 layers of the stomach
Mucosa
Submucosa
Muscularis Externa
Serosa
3 layers of the mucosa
epithelium
lamina propria
muscularis mucosae
What is unique about the epithelium of the mucosa?
Surface mucous lining cells
What is found in the lamina propria of the mucosa?
smooth muscle
CT
gastric glands
lymphatic nodules
3 layers of the muscularis mucosae
inner incomplete oblique mucosa
middle circular
outer longitudinal
What is found in the submucosa?
blood vessels (submucosal plexus)
3 layers of the muscularis externa
- incomplete inner oblique
- thick middle circular (forms pyloric sphincter)
- outer longitudinal
Functions of the stomach
acidifies and converts bolus into chyme
produces digestive enzymes pepsin, rennin, and gastric lipase and some hormones
What are the longitudinal submucosal folds of the stomach called? What do these do?
Rugae; allow the stomach to distend when filled
3 histological regions of the stomach and their glands
cardiac region: cardiac glands
fundus and body: gastric glands
pyloric region: pyloric glands
What covers the gastric mucosa? What is the purpose of this?
a protective layer of mucus; protects the surface epithelium from mechanical erosion
The surface of the stomach is covered by (blank) that open into gastric glands
gastric pits
What type of cells line the stomach and continue into the gastric pits?
surface mucous cells
Surface mucous lining cells produce thick insoluble mucous, which traps (blank). What does this trapped “thing” do?
Bicarbonate; helps neutralize some of the acid found in the stomach to neutralize pH
5 cell types of the gastric gland
- Mucus neck cells
- Stem cells
- Parietal cells
- Chief cells
- Enteroendocrine cells