Large intestine histology

Question 1

The large intestine mucosa is made of this type of epithelium

Answer 1

Simple columnar

Question 2

Are there plicae circularis in the large intestine?

Answer 2

No

Question 3

Are there villi in the large intestine?

Answer 3

No

Question 4

Plicae circularis and villi are not found beyond this junction

Answer 4

Ileocecal junction

Question 5

Are goblet cells more numerous in the small or large intestine?

Answer 5

Large intestine

Question 6

Are there paneth cells in the large intestine?

Answer 6

No
(except sparsely in the cecum during transition)

Question 7

Does the lamina propria of the small or large intestine have increased immune system?

Answer 7

Increased in the colon

Question 8

Does the lamina propria of the large intestine have lacteal?

Answer 8

No; lacks
Only occasional lymphatic vessels

Question 9

Isolated lymphatic follicles (ILF) can be seen in this layer of the large intestine

Answer 9

Lamina propria

under the muscularis mucosae, extending into the submucosa

Question 10

Isolated lymphatic follicles (ILF) are seen in this part of the GI tract

Answer 10

Large intestine

Question 11

The outer layer of this alimentary canal layer of the large intestine consists of longitudinal bands of muscle (teniae coli)

Answer 11

Muscularis externa

Question 12

The outer layer of the muscularis externa of the large intestine consists of these longitudinal bands of muscle

Answer 12

Teniae coli

Question 13

These penetrate the inner layer of muscle at irregular intervals along the length and circumference of the colon
This allows for individual contraction of different colon segments, which leads to the formation of haustra coli

Answer 13

Teniae coli

Question 14

The teniae coli penetrate the inner layer of muscle at irregular intervals along the length and circumference of the colon
This allows for individual contraction of different colon segments, which leads to the formation of this

Answer 14

Haustra coli

Question 15

This is a diverticulum of the cecum and has layers similar to the large intestine

Answer 15

Appendix

Question 16

This is the characteristic feature of the appendix

Answer 16

Lymphoid tissue
(has multiple lymphatic follicles)

Question 17

Is the appendix covered by serosa or adventitia?

Answer 17

Serosa

Question 18

The appendix is a common site for this type of tumors

Answer 18

Carcinoid tumor

(which originate from the enteroendocrine cells of the lining mucosa)

Question 19

In this part of the GI tract, the crypts of Lieberkuhn are longer with prominent veins in the mucosa

Answer 19

Rectum

Question 20

Does the large intestine contain more or less columnar absorptive cells than goblet cells?

Answer 20

More

Question 21

Does the amount of goblet cells increase or decrease from the large intestine to the rectum?

Answer 21

Increase

Question 22

The simple columnar epithelium with tubular intestinal glands in the rectum changes abruptly to this type of epithelium in the anal canal

Answer 22

Stratified squamous

Question 23

This type of epithelium with tubular intestinal glands in the rectum changes abruptly to stratified squamous epithelium in the anal canal

Answer 23

Simple columnar

Question 24

The rectum has this type of epithelium

Answer 24

Simple columnar

Question 25

The anal canal has this type of epithelium

Answer 25

Stratified squamous

Question 26

This is the most distal portion of the alimentary canal

Answer 26

Anal canal

Question 27

This anal canal zone is found in the upper third of the anal canal and contains simple columnar epithelium

Answer 27

Colorectal zone (CRZ)

Question 28

This anal canal zone is the middle third of the canal and possesses a stratified columnar epithelium due to it being the transitional point

Answer 28

Anal transition zone (ATZ)

Question 29

This anal canal zone is the lower third of the canal that is lined by stratified squamous epithelium and is continuous with the perianal skin

Answer 29

Squamous zone (SQZ)

Question 30

This anal canal zone is continuous with the perianal skin

Answer 30

Squamous zone (SQZ)

Question 31

Near the anus, the circular layer of the rectum’s muscularis externa thickens to form this

Answer 31

Internal anal sphincter

Question 32

Near the anus, this layer of the rectum’s muscularis externa thickens to form the internal anal sphincter

Answer 32

circular layer

Question 33

This anal sphincter is formed by the striated muscle of the pelvic floor

Answer 33

External anal sphincter

Question 34

The external anal sphincter is formed by this

Answer 34

Striated muscle of the pelvic floor

Question 35

The anal glands are surrounded by this type of tissue

Answer 35

Diffuse lymphatic tissue

Question 36

The anal glands can lead to the formation of these between the anal canal and the perianal skin

Answer 36

Pathologic fistulas

Question 37

These are large apocrine glands found in the skin surrounding the anal orifice, in some animals this acts as a sex attractant

Answer 37

Circumanal glands

Question 38

The submucosa of the anal columns contains the terminal ramification of this artery and venous plexus

Answer 38

Superior rectal artery and rectal venous plexus

Question 39

Enlargements of these veins constitute the internal hemorrhoids

Answer 39

Submucosal veins of the anal columns