Anatomy of Stomach Flashcards
(44 cards)
Areas of the stomach?
Fundus
Cardia
Body
Pylorus
Mechanical regions of the stomach?
Orad
Caudad
3 Phases of gastric secretion?
Cephalic
Gastric
Intestinal
Describe the cephalic phase?
It is before the food reaches the stomach
- Increased HCL secretion
Describe the gastric phase?
Stomach distension causes increase in HCL secretion via mechanoreceptors
Describe when the intestinal phase occurs?
Occurs after food has left the stomach
3 secretagogues that induce HCl secretion?
ACh
Gastrin
Histamine
What does ACh do?
Activates parietal cells
Inhibits D cells
What does gastrin do?
Activates parietal cells
What doe histamine do?
Activates parietal cells to secret HCl
What do secretagogues do?
Induce HCl secretion by activating parietal cells
Describe the hypothalamic control of hunger which stimulates appetite?
Orexigenic neurons go to the feeding centre in the lateral hypothalamic area
Orexigenic neurones stimulate/inhibit?appetite??
Stimulate
Which neurones inhibit appetite?
Anorexiogenic neurons
Describe hypothalamic control of hunger which inhibits appetite?
Anorexiogenic neurones go to satiety centre in the ventromedial nuclei and inhibit appetite
Where is the vomiting centre?
In the medulla
Different stimuli for vomiting?
Toxins
Mechanical
Motion
What supplies the stomach?
All blood comes from the coeliac trunk
Which arteries run along the lesser curvature of the stomach?
Right and left gastric arteries
Which arteries run along the greater curvature of the stomach?
Right and left gastro-omental arteries
Gastrin fact file?
Cell?
Location?
Role?
- G cell
- Gastric antrum/duodenum
- H+ secretion, decreases stomach contractions, delays gastric emptying to aid digestion
Role of gastrin?
H+ secretion > decreases stomach contractions > which delays gastric emptying > to aid digestion
CCK fact file?
Cell?
Location?
I (i) cell
Duodenum/ jejunum
Role of CCK?
- Bile secretion
- Satiety
- Pancreatic enzymes (lipase)
