Digestive System Flashcards
Contents of the Digestive System:
- Oral Region
- Alimentary Canal
- Extrinsic Glands
Basic Histological Layers:
- Mucosa
- Submucosa
- Muscularis Externa
- Serosa/Adventitia
Mucosa:
a. Epithelium
b. Lamina Propria
c. Muscularis Mucosa
Submucosa:
a. Submucosal Plexus
b. “Plexus of Meissner”
Muscularis Externa:
a. Myenteric Plexus
b. “Plexus of Auerbach”
Lining epithelium of mucosa is made of _________
simple squamous columnar epithelium.
It sits on a basement membrane
Mucosa
Mucosa:
Its______ is made of loose connective tissue full of macrophages and lymphocytes.
Lamina Propria
Mucosa:
______ separate mucosa from submucosa contraction of which leads to increase contact of epithelium with food.
Muscularis mucosae
A layer of dense connective tissue
Submucosa
Rich in blood vessels
Submucosa
controls glandular secretions, alters electrolyte and water transport.
Plexus of Meissner
Sometimes, it may contain mucus glands.
Submucosa
Two layers of smooth muscle fibers (inner circular and outer longitudinal)
Muscularis Externa
What is distributed between the two muscle layers - regulates the peristaltic waves that move the food from esophagus to anal opening in the Muscularis Externa
Myenteric (Auerbach) nerve plexuses
With the submucosal nerve plexuses, they help propel and mixing the food.
Muscularis Externa
A layer of loose connective tissue covered by a layer of simple squamous epithelium called mesothelium
Serosa/Adventitia
It contains the lymphatic and blood vessels of the GI tract and fat tissue.
Serosa/Adventitia
Function of the Digestive System
- Movement of food
- Secretion of Digestive Juices
- Absorption of digested foods, water, and electrolytes.