Dr. Paul - Histology of the Upper GI Tract Flashcards
What 4 things make up the upper GI tract
oral cavity esophagus stomach duodenum
What are the 4 layers of the upper GI tract?
Mucosa Submucosa Muscularis Externa Serosa
What 3 parts make up the mucosa
epithelium lamina propria muscularis mucosae
In which layer is the plexus of meissner located
in the submucosal plexus
In which layer is the plexus of auerbach located
in the myenteric plexus
What are the 4 basic mucosal types
protective secretory absorptive protective
where is protective mucosa found ?
Oral Cavity, Pharynx, Oesophagus, Colon and Anal
What kind of cells make up protective mucosa?
The Surface Epithelium is of Stratified Squamous Type and although not keratinised in Humans, it may be keratinised in some animals that have a coarse diet (e.g. Rodents)
Where is secretory mucosa found
This Type of Mucosa occurs only in the Stomach & Small Intestine
what is the function of secretory mucosa
These Glands Produce Acid and Digestive Enzymes to facilitate digestion of food and At the same time Secreting Mucus to Protect the Mucosa itself from Injury
where is absorptive mucosa found
small intestines and colon
what is a crypt of leberikhn?
The Mucosa is arranged into Finger-Like Projections Called Villi which serve to Dramatically Increase Surface Area of the Mucosa, with Intervening Short Glands Called Crypts of Lieberkuhn
what is a brunners gland
In the Duodenum, some Crypts Extend through the Muscularis Mucosae to form Submucosal Glands called Brunner’s Glands
where is absorptive mucosa found
It lines the Entire Large Intestine
what is the function of absorptive mucosa
water absorption lubricate the passage of feces
