Lecture 12: Peritoneum & Stomach Flashcards
Where is the myenteric plexus? What does the submucosal plexus do?
MP = between circ and long layers
SMP = talk to glands/epithelium
What are interstitial cells of cajal and where are they located?
Pacemakers of alimentary canal, found in myenteric plexus.
What is intrinsic factor?
Produced by stomach, needed for B12 absorption
What is rugae?
Rugae is the intense folding of mucosa found in stomach.
What is found in the superior stomach?
LES (entrance)
Cardia entrance
Fundus (dome above cardia)
What is found in the inferior stomach?
Pyloric canal
Pyloric sphincter (exit)
Pyloric antrum (‘blender’)
Which two arteries supply the greater curvature? Lesser? Where do these arteries come from?
Greater: R/L gastro-omental
Lesser: R/L gastric artery
Branch off of celiac trunk.
What is the system of venous drainage for the stomach called? Innervation?
Venous: hepatic portal vein
Innervation: Vagus N (stimulatory), splanchnic N (inhibitory)
What does the gastric pit do, and where is it located?
Releases digestive secretions and protective mucous, found in mucosa.
What are three cells found in the stomach, and what do they secrete?
Mucous: mucin & bicarbonate
Parietal: HCl & intrinsic factor
Chief: pepsinogen & gastric lipase
What do G cells secrete? What do they stimulate and inhibit?
Secrete gastrin.
Stimulate: parietal cells, chief cells, LES, motility
Inhibit: pyloric sphincter
What are the three phases of digestion in the stomach?
- cephalic phase: vagus N stimulates secretion before food is swallowed
- gastric phase: food stretches stomach, gastric secretions
- intestinal phase: duodenum distended, chyme in duodenum, feedback to stomach.
Which hormones promote digestion, which inhibit?
Promote: gastrin
Inhibit: CCK, secretin
What are the five peritoneal folds?
- lesser omentum
- mesocolon
- mesentery
- falciform ligament
- greater omentum
Name the retroperitoneal organs (Hint: SAD PUCKER)
Suprarenal
Aorta/IVC
Duodenum
Pancreas
Ureter
Colon
Kidney
Esophagus
Rectum
