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Anatomy of GI > Histology of the GI tract > Flashcards

Histology of the GI tract Flashcards

1
Q

What are the layers present in all layers of the GI

A
  • Mucosa
  • Submucosa
  • Muscualris propria
  • Serosa
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2
Q

What are the layers of the mucosa?

A
  • Epithelium
  • Lamina propria
  • Muscularis mucosal
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3
Q

Where are secretory mucosa found

A

In the stomach

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4
Q

Where is absorptive mucosa found?

A

in the SI

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5
Q

Where is absorptive/protective mucosa found?

A

In the LI

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6
Q

What feature is characteristic of the SI

A

villi and crypts

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7
Q

what is the cells are found in the LI

A

cells which specialise in water absorption and mucous secretion

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8
Q

What kind of epithelium is found in the oesophagus?

why?

A

Stratified squamous non-keratinised

Deals with large clumps of food

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9
Q

what type of muscle is found in the muscularis external of the oesophagus

A

Top 1/3rd: SKELETAL
Middle 1/3rd: SKELETAL AND SMOOTH
Bottom 1/3rd: SMOOTH

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10
Q

Why are different types of muscle found in the oesophagus?

A

Skeletal is used for voluntary control

Smooth is used for in voluntary control

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11
Q

What is found in the submucosa of the oesophagus?

A

Mucosal glands

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12
Q

What type of epithelium is found in the stomach?

A

Simple columnar epithelium

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13
Q

What is found in the mucosa of the stomach?

A
  • Lots of glands for digestion- release contents into lamina propria
  • Parietal: stain pink as they secrete Hcl
  • Chief cells: At base of gland- secrete pepsinogen- a lot darker
  • Gastric pits
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14
Q

Is there much lamina propria in the stomach?

A

NO

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15
Q

Properties of histology of small intestine

A 
GENERAL:
-Look for villi 
-Look for crypts 
-Look for Peyer's patches 
Duodenum: Brunner's cells 
Jejunum:few of Peyer's patches and fewer Brunner's cells
Ileum:Many Peyer's patches
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16
Q

What are Peyer’s Patches?

A

Collection of lymphoid tissue

17
Q

What type of epithelium is found in the SI?

A

simple columnar

18
Q

In what layer at Brunner’s glands and peyers patches found?

A

In the submucosa

19
Q

what is the function of Brunner’s glands?

A

They coat the intestine with a lining of anti-acid lining

20
Q

What are the large folds which extend into the lumen known as?

A

Plicae

21
Q

What kind of muscle is found in the muscularis mucosa fo the SI?

A

smooth

22
Q

what kind of cells are found in the surface epithelium of the SI?

A

Goblet cells which secrete mucin

23
Q

General feature of LI

A
  • lots of moth like cells- Mucous secreting
  • NO VILLI
  • thick mucosa
24
Q

What sort of epithelium is found in the rectum?

A

Stratified squamous

25
Q

What is the name of the plexus between the circular and longitudinal muscle called?

A

Myenteric

26
Q

What is the name of the plexus in the submucosa

A

Meissner’s plexus/ submucosal plexus

27
Q

What is the function of the submucosal plexus

A

Controls the muscularis mucosa

28
Q

what is the function of myenteric plexus

A

controls muscularis externa

29
Q

What are the 4 different types of mucosa

A
  • Protective: stratified squamous non-keratinised
  • Secretory: Lots of glands
  • Absorptive: VIlli/ crypts
  • Protective/absortive: rectum

Anatomy of GI (20 decks)

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