GIT Flashcards
What are the 4 layers of the GIT tract
Mucosa, submucosa, muscularis externa and serosa/adventitia
What comprises the mucosa
Epithelial cells, basement membrane, lamina propria and the muscularis mucosea
What divides the mucosa and the submucosa
The muscularis mucosea
What are the two layers of the muscularis externa
The inner circular and the outer circular
What is special regarding serosa
Is the layer of epithelial cells that line a fluid filled cavityor potential cavity such as the peritoneum or the omentum. This is also known as mesothelium
What are the general epithelial structures of teh oesophagus and anal canal
Thick stratified squamous
What are the general epithelial structures of the stomach
Secretory epithelium
What are the general epithelial structures of teh oesophagus and anal canal SI
Absorptive villi cilliated pseudostratified columnar
What are the general epithelial structures of the LI
Secretory pseudostratified columnar
What are two components of the ENS within the GIT and their function
- submucusal ganglia
Responsible for regulating sensory input of the GIT and regulating the release of secretions into the GIT
Myenteric plexus
Responsible for the coordination of the muscle contraction of the GIT wall, for both the circular and the longditudinal muscles
What are the different types of glands in the stomach
- Mucous cells secrete Mucus
- Parietal cells secrete HCl
- Chief cells secrete Pepsinogen
- Enteroendocrine cells secrete hormones such as gastrin
What are the plicae circularis
They are the folds in the small intestine
What are present on the plicae circularis
Further folds known as villi
What compose the villi
Enterocytes with even more folds known as microvilli
What are the depressions on the villi that secrete fluid and mucous
They are the crypts of Lieberkuhn
