3.3 The Histology of the Gut Tube Flashcards
What are the Layers of the Gut Tube found constantly throughout the Alimentary Tract?
- The Mucosa
a) The Epithelium
b) The Lamina Propria
c) Muscularis Mucosae (Interna) - The Sub-Mucosa
- The Muscularis Externa
a) Circular Muscle
b) Longitudinal Muscle - The Serosa / Adventitia
What types of Muscle form the Muscularis Externa in the Oesophagus?
Proximal 1/3 - Skeletal Muscle
Middle 1/3 - Mix of Smooth Muscle and Skeletal Muscle
Distal 1/3 - Smooth Muscle
What kind of Surface Epithelium is present on the Oesophagus?
Stratified Squamous Epithelium
for the protective function
What type of Muscle is the Muscularis Mucosae (Interna)?
Smooth Muscle
Where are the larger Blood Vessels found in the Oesophagus?
In the Sub-Mucosa
What are the large folds present in the wall of the Stomach known as?
Gastric Folds (Rugae)
What are the Gastric Pits?
They are indentations in the Stomach which denote entrances to the Tubular Gastric Glands
What secretory cells are present in the Gastric Glands?
Surface Mucous Cells
What are the folds which extend into the Lumen of the Small Intestines called?
Circular, Mucosal Folds
What is superimposed on these Large Circular Mucosal Folds?
Villi - Finger like processes
What is the function of these Villi?
To increase the Surface area to aid absorption
What Surface Epithelium is present on the Villi?
Simple Columnar
What is present in the Lamina Propria?
Glands
Do the Glands extend further down than the Muscularis Mucosae (Interna)?
No
What are the names of these Glands which are adjacent to the Villi, and do not extend beyond the Muscularis Mucosae?
The Crypts of Lieberkuhn