Highison: Stomach Flashcards

1
Q

Discuss the anatomy of the stomach.

A

Esophagus–>cardia–>fundus–>body–>pyloric antrum–>pyloric canal–>pylorus–>duodenum

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

4 layers of the stomach

A

Mucosa
Submucosa
Muscularis Externa
Serosa

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

3 layers of the mucosa

A

epithelium
lamina propria
muscularis mucosae

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What is unique about the epithelium of the mucosa?

A

Surface mucous lining cells

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What is found in the lamina propria of the mucosa?

A

smooth muscle
CT
gastric glands
lymphatic nodules

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

3 layers of the muscularis mucosae

A

inner incomplete oblique mucosa
middle circular
outer longitudinal

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What is found in the submucosa?

A

blood vessels (submucosal plexus)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

3 layers of the muscularis externa

A
  1. incomplete inner oblique
  2. thick middle circular (forms pyloric sphincter)
  3. outer longitudinal
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Functions of the stomach

A

acidifies and converts bolus into chyme

produces digestive enzymes pepsin, rennin, and gastric lipase and some hormones

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What are the longitudinal submucosal folds of the stomach called? What do these do?

A

Rugae; allow the stomach to distend when filled

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

3 histological regions of the stomach and their glands

A

cardiac region: cardiac glands
fundus and body: gastric glands
pyloric region: pyloric glands

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What covers the gastric mucosa? What is the purpose of this?

A

a protective layer of mucus; protects the surface epithelium from mechanical erosion

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

The surface of the stomach is covered by (blank) that open into gastric glands

A

gastric pits

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What type of cells line the stomach and continue into the gastric pits?

A

surface mucous cells

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Surface mucous lining cells produce thick insoluble mucous, which traps (blank). What does this trapped “thing” do?

A

Bicarbonate; helps neutralize some of the acid found in the stomach to neutralize pH

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

5 cell types of the gastric gland

A
  1. Mucus neck cells
  2. Stem cells
  3. Parietal cells
  4. Chief cells
  5. Enteroendocrine cells
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Which cells of the gastric gland secrete gastric intrinsic factor?

A

parietal cells

18
Q

What is a unique histological feature of parietal cells?

A

They have intracellular canaliculi lined by microvilli

19
Q

GIF is a glycoprotein which binds to which vitamin? AutoABs against GIF or lack of GIF can lead to this condition.

A

Vitamin B12; pernicious anemia

20
Q

T/F: we lose the ability to produce GIF with aging.

A

True

21
Q

Chief cells secrete this enzyme and precursors to these two enzymes.

A

pepsinogen; rennin and lipase

22
Q

These cells are also referred to as APUD cells.
You must have a special stain to see them.
Produce endocrine, paracrine secretion.

A

Enteroendocrine cells

23
Q

Four parts of the gastric gland

A

pit, neck, upper region of the body, lower region of the body

24
Q

Surface mucous and mucous neck cells are replaced every (blank) days

A

3-6

25
Q

Gastric gland cells are replaced at a (blank) rate.
Parietal cells are replaced about every (blank) days.
Chief and enteroendocrine cells about every (blank) days.

A

slower; 150-200; 60-90

26
Q

Epithelium found in each region: cardiac, fundic and body, pyloric?

A

simple columnar

27
Q

Where are surface mucous cells found in each region: cardiac, fundic and body, pyloric?

A

cover entire luminal surface

28
Q

Chief cells in the following regions? Cardiac, fundic and body, pyloric?

A

No; yes; no

29
Q

Parietal cells in the following regions? Cardiac, fundic and body, pyloric?

A

Rare; abundant; few

30
Q

Enteroendocrine cells in the following regions? Cardiac, fundic and body, pyloric?

A

Rare; rare; rare

31
Q

Serosa in the following regions? Cardiac, fundic and body, pyloric?

A

yes; yes; yes

32
Q

In what layers of the stomach are the ruga found?

A

Gastric mucosa and submucosa

33
Q

The mucosal glands in this region of the stomach have wide, deep gastric pits with short, slightly coiled, simply tubular glands. Pits extend into less than half of mucosa.

A

Cardiac

34
Q

The mucosal glands in this region of the stomach have narrow, shallow pits with straight, branched tubular glands. Pits extend over half the thickness of mucosa.

A

Fundus and body

35
Q

The mucosal glands in this region of the stomach have wide, deep pits with coiled, branched, tubular glands. Pits extend over half the thickness of mucosa.

A

Pylorus

36
Q

What two things do parietal cells secrete?

A

HCl and gastric intrinsic factor

37
Q

Where does absorption of most of the B12 occur in the small intestine?

A

ileum

38
Q

What is B12 essential for? Why is this a problem in pernicious anemia?

A

RBC maturation; need more RBCs!

39
Q

What is abundant in parietal cells to generate ATP to pump H+?

A

mitochondria

40
Q

Surface muscous cells, which line the gastric pits of the stomach, produce two important things.

A

insoluble thick mucous

bicarbonate which gets trapped in the thick mucous

41
Q

Which region of the stomach has gastric glands with the deepest pits?

A

pylorus

42
Q

The pits found in the cardiac glands and the pyloric glands are both lined by (blank).

A

mucous-secreting cells