91. Stomach Flashcards
What are the four regions of the stomach?
Cardia, Fundus, Body, Pyloric
What is the incisura angularis?
Intraluminal protrusion of tissue at the midpoint of the lesser curvature
What does the incisura angularis separate?
Antrum and body
Where does the papillary process of the liver lie?
In the angular notch
What are the parts of the greater omentum?
Bursal, splenic, and veil portions
What does the lesser omentum attach to?
The liver and the stomach
What artery supplies the greater curvature of the stomach?
Gastroepiploic artery
What are the three main branches of the celiac artery?
Splenic, hepatic, and left gastric arteries
What artery supplies the pylorus and pyloric antrum?
Right gastric artery
What does the hepatic artery continue as after branching to the liver and gallbladder?
Gastroduodenal artery
What does the gastroduodenal artery supply?
Right pancreatic limb and greater curvature of the stomach
What artery supplies the fundus of the stomach?
Left gastric artery
Where does the venous drainage of the stomach occur?
Portal vein through the splenic vein and gastroduodenal vein
Which lymph nodes are involved in the lymphatic drainage of the stomach?
Gastric, splenic, and hepatic lymph nodes
What nerves innervate the stomach?
Vagus nerves and sympathetic fibers of the celiac plexus
How many muscle layers does the stomach have?
Three layers: longitudinal, circular, and oblique
What are the four layers of the gastric wall?
Serosa, muscle, submucosa, and mucosa
Which muscle layer of the stomach is not present in the fundus?
Circular layer
Where do the oblique muscle fibers of the stomach primarily lie?
Body and fundic areas
What type of tissue is found in the submucosa of the stomach?
Elastic areolar tissue
What are the three types of glands in the stomach?
Cardiac, pyloric, and gastric glands proper
Where are the cardiac glands primarily located?
Around the cardia and antrum
What do the pyloric glands primarily produce?
Mucus
What cells are found in the gastric glands of the fundus and body?
Parietal, chief, mucous neck, and endocrine cells
What is the primary function of parietal (oxyntic) cells?
Maintain gastric acidic pH and produce intrinsic factor
What do chief cells secrete?
Pepsinogen
What do mucous neck cells secrete?
Mucus
What hormones do gastric endocrine cells produce?
Gastrin, histamine, and serotonin
What initiates the process of swallowing?
Receptive relaxation
What is the result of gastric accommodation?
Further relaxation of the fundus
What is contractile retropulsion?
Process that reduces food particles to an appropriate size for gastric emptying
How does the gastric mucosa repair superficial epithelial injuries?
Epithelial migration without proliferation
What type of injury is considered an ulcer in the stomach?
Injury extending into the submucosal layer
What enhances healing in the stomach?
Extensive and redundant blood supply
How long should food be withheld before surgery?
8 to 12 hours
What effect does longer fasting times have on gastric pH in dogs?
Decreases gastric pH
What is gastroesophageal reflux and its occurrence rate in dogs undergoing anesthesia for orthopedic procedures?
Reflux of stomach contents into the esophagus; 57% occurrence rate
What medications can be given to increase gastric pH before surgery?
Proton pump inhibitors or histamine2 (H2) receptor blockers
What is the purpose of incisional gastropexy?
To attach the stomach to the abdominal wall
What is a belt-loop gastropexy?
Seromuscular flap passed through a tunnel created in the abdominal wall