Lecture 33-35- Tubular Gastrointestinal Tract Flashcards
Layers of the GI tract
mucosa
Submucosa
Muscularis
Serosa
What lines the GI mucosa?
Epithelium
What are the layers of the Mucosa layer
Epithelium
Lamina propria
Muscularis mucosa
What mucosal layer contains the vessels and lymphatic ducts?
Lamina propria
What tissue type in the submucosal layer provides stretch?
Collagen
What is contained within the GI submucosal layer?
Nerves and vessels
What are the layers of the Muscularis layer?
Inner circular layer
Outer longitudinal layer
What is the name of the plexuses found between the two muscularis layers
Myenteric plexuses
What line the outside of the serosa in the enteric system?
Mesothelial cells
What type of cells line the outside of of the serosa of the esophagus and rectum?
Adventitia (analogous to the mesothelial cells
What cell type lines the esophageal lumen?
Stratified squamous epithelium
What tissue layer of the esophagus houses the mucous glands?
Submucosa
What is the only part of the GI tract that contains skeletal muscle in the muscularis layer?
Esophagus
What composes the esophageal adventitia?
Loose connective tissue and adipose tissue
Sections of a ruminant stomach, cranial to caudal
Reticulum
Omasum
Rumen
Abomasum
What forestomach has gross papillae?
Rumen
What type of tissue lining the rumen does not handle acid well, and can cause rumen acidosis from high carb diets
Stratified squamous epithelium
Are rumen papillae longer from high forage diets or ground diets?
High forage diets
Ground diets can cause rumen acidosis, wearing down the papillae
What forestomach section has a gross honeycomb pattern?
Reticulum
What forestomach section has a gross book pages appearance?
Omasum
What additional section in a pig stomach is nonglandular and cannot tolerate acid?
Pars esophagea
Which species have a large nonglandular region of their stomachs?
rats and horses
What section of the glandular stomach has the thickest mucosal layer and is lined by mucus neck cells (goblet cells)
Fundus
What cells in the mucosal layer of the fundus secrete HCl and are stained pink?
Parietal cells
What cells in the mucosal layer of the Fundus secrete pepsinogen and are stained blue?
Chief cells
What differentiates the gastric fundus from the pylorus microscopically?
The pylorus has no chief or parietal cells and has more branched tubular mucus glands
Where to enteric cells proliferate?
Villous crypts
What is the name of a lymph vessel embedded in the lamina propria of a small intestinal villi?
Lacteal
What is the name of a nerve plexus within the submucosa?
Meissner’s plexus
What is the only part of the GI tract in which the submucosa has glands?
Duodenum
What type of gland is found in the submucosa of the duodenum and what does it secrete?
Brunner’s glands secrete alkaline mucus to neutralize acid
Name of lymph aggregates that form the Peyer’s patches of the ileum, jejunum, and large intestine
Gut-associated lymphoid tissue (GALT)
What is the microscopic difference between the small intestine and large intestine
the large intestine has no crypts/vili
