Exam 3 – Lecture 24: GI 3 Flashcards

1
Q

What are the layers of the small intestine?

A

Mucosa
Submucosa
Muscularis
Serosa

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2
Q

Describe the mucosa of the small intestine

A

Columnar epithelium
Brush border (microvilli on the villi)
Lamina propria

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3
Q

What are the 2 layers of muscularis?

A

Inner circular layer

Longitudinal layer

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4
Q

Where is the inner circular of the muscularis?

A

Goes around the intestine

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5
Q

Where is the longitudinal layer of the muscularis?

A

Runs the length of the intestine

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6
Q

What is the serosa of the small intestine also known as?

A

Visceral peritoneum

Tunica adventitia

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7
Q

What is the serosa of the small intestine?

A

Simple squamous epithelium on a connective tissue base

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8
Q

What are the villi lengths in the duodenum?

A

Tall villi

Deep cryptes

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9
Q

What are the villi lengths in the jejunum?

A

Middle villi

Middle crypts

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10
Q

What are the villi lengths in the ileum?

A

Sort villi

Shallow crypts

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11
Q

What is the small intestine like in birds?

A

Have paired ceca

Meckel’s diverticulum

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12
Q

What is meckel’s diverticulum?

A

Remnant of the umbilical cord in the middle of the intestine

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13
Q

What are the cell types of the small intestine?

A
Enterocytes
Goblet cells
Paneth cells
Enteroendocrine cells
M cells
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14
Q

Describe enterocytes

A

Enzymes, H2O, absorption
Tight junctions
Brush border

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15
Q

What can be found in the lamina propria of the small intestine

A

Submucosal glands
Submucosal plexus
Myenteric plexus
GALT

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16
Q

What can be found in GALT?

A

Dome sites
Peyer’s patches
M cells

17
Q

Describe the large intestine/cecum

A
Species vairation
Mostly straight tubular crypts
No villi
Many goblets
No paneth cells
Lymphoid tissue
18
Q

What happens in the large intestine/cecum?

A

Much absorption of water and nutrients
Elimination
Mucocutaneous junction