Trans - GI Histology Flashcards Preview

[OS 206] 1st Exam > Trans - GI Histology > Flashcards

Flashcards in Trans - GI Histology Deck (102)
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1

Germ layer origin of the proctodeum and stomodeum

Ectoderm

2

Germ layer origin of the gut

Endoderm, except for proctodeum and stomodeum

3

Area of referred pain from the foregut

Epigastric region

4

Area of referred pain from the midgut

Periumbilical region

5

Area of referred pain from the hindgut

Hypogastric region

6

Embryonic precursor of foregut

Preenteron

7

Embryonic precursor of midgut

Mesenteron

8

Embryonic precursor of hindgut

Metenteron

9

Layers of the gut from internal to external

1. Mucosa
2. Submucosa
3. Muscularis externa / tunica muscularis
4. Serosa / adventitia

10

Meissner’s plexus is located in the:

Submucosa

11

Meissner’s plexus: function

Parasympathetic innervation to control contraction of the GIT

12

Auerbach’s plexus is located in the:

Tunica muscularis

13

Auerbach’s plexus: function

Sympathetic and parasympathetic motor innervation to tunica muscularis

14

Difference of serosa and adventitia

Serosa – with mesothelium (peritoneal or mesothelial pleura)

Adventitia – without mesothelium, lining is continuous with tissues or organs

15

Most numerous tongue papillae

Filiform

16

Least numerous tongue papillae

Circumvallate

17

Separates anterior and posterior tongue

Sulcus terminalis

18

What glands are associated with the circumvallate papillae?

Glands of von Ebner

19

Glands of von Ebner: function

Lubrication, solvent for dissolving food

20

Epithelium of oropharynx

Stratified squamous nonkeratinizing

21

Epithelium of esophagus

Stratified squamous thinly keratinized epithelium

22

Composition of muscularis externa in esophagus

Varying depending on segment

Upper 1/3 – purely striated
Middle 1/3 – mixed striated and smooth
Lower 1/3 – purely smooth

23

Process by which undamaged cells from the bottom of the gastric pits migrate to denuded basal lamina

Mucosal restitution

24

How to histologically differentiate the different parts of the stomach

The different parts of the stomach vary only in mucosal glands

25

Longitudinal folds in stomach

Rugae

26

Depressions in rugae lining the entire stomach

Gastric pits / foveolae

27

Epithelium of stomach

Simple columnar

28

3 layers of muscularis externa in stomach

1. Longitudinal – outermost, complete at pylorus
2. Circular – middle, complete, forms pyloric sphincter
3. Oblique – innermost, incomplete, thickest at cardia

29

Where are the gastric oxyntic glands found?

Gastric fundus and body

30

Cells in gastric oxyntic glands

1. Mucus neck cells
2. Chief cells
3. Parietal / oxyntic cells
4. Enteroendocrine / GI endocrine cells / APUD cells
5. Stem cells