Flashcards in Upper GI Tract Deck (99)
What is the upper gastrointestinal tract?
An organ system responsible for transporting and digesting foodstuffs, absorbing nutrients and expelling waste
What is included in the gastrointestinal tract?
Oral cavity, oesophagus, stomach, small intestine, large intestine and anus
What does the muscular wall of the GI tract provide?
Strength and aids in transport of food
What does the mucosa layer of the GI tract consist of?
The epithelium and the lamina propria
What does the lamina propria contain?
Blood vessels, lymphatics, mucous glands
What is the muscularis mucosae?
It is a thin layer of muscle of the gi tract located outside the lamina propria and separates the lamina propria from the submucosa. Involved in local movement and folding of the mucosa
What is contained in the submucosa?
nerves, blood vessels and supporting connective tissue
What is the muscularis propria layer of the GI tract?
Contains two layers, the outer longitudinal layer and the inner circular layer
What is special about the muscularis propria in some places?
In the stomach there is a third inner layer, along with the outer longitudinal layer and inner circular layer, called the third inner oblique layer
What is the adventitia?
A layer of loose supporting tissue within the abdominal cavity
Where the gut lies within the abdominal cavity, what is the adventitia referred to and what type of cells make it up?
Referred to as the serosa and is lined by a simple squamous epithelium called the mesothelium
There are basic mucosal forms in the GI tract, where would you find protective?
In the oral cavity, pharynx, oesophagus, anal canal
There are basic mucosal forms in the GI tract, where would you find secretory?
There are basic mucosal forms in the GI tract, where would you find absorptive?
There are basic mucosal forms in the GI tract, where would you find absorptive/protective?
the whole large intestine
What time of epithelium would you find in protective mucosa?
Secretory mucosa is only found in which part of the gi tract?
In the stomach
If you had to describe the tongue as a muscle how would you describe it?
A mass of striated muscle
What is the tongue covered by?
By a mucous membrane with a variable structure
What covers the dorsal surface of the tongue?
The posterior third of the tongue is separated from the anterior two thirds of the tongue by what?
a v shaped boundary
The posterior portion of the tongue mainly contains what?
Small lymphoid aggregates
Where are filiform papillae found on the tongue and do they contain taste buds?
They are found on the entire surface of the tongue and no they do not contain taste buds
Where are the fungiform papillae found on the tongue and do they contain taste buds?
They are found interspersed among the filiform papilla and they contain taste buds
Where are the foliate papillae found?
They are found towards the back edges of the tongue and they are not well developed in humans
How would you describe the structure of the circumvallate papillae on the tongue?
They are the largest and least common, encircled by a deep cleft,
What is the side of the circumvallate papillae on the tongue?
Very large, 7-12mm
What types of glands are associated with the circumvallate papillae?
With serous glands (von Ebner's glands)
Where do the serious glands called von ebner's glands open into in the circumvallate papillae?
Open into the base of the cleft