Histology Of Large Intestine

Question 1

Large intestine

Appox. ____ cm long
•divided into several regions.

•It consists of: ____, ______,_____,_____, and _____

Answer 1

180

cecum

appendix, colon, rectum and anal canal.

Question 2

The Cecum
•is continuous with the ileum at the ________ and forms a ___ pouch at the (proximal or distal?) end of the colon.

•It bears the _____, a (small or large?) , (slender or robust?) diverticulum.

Answer 2

ileocecal junction

blind

Proximal

appendix

Small

Slender

Question 3

Colon Histological Features— Mucosa

•The mucosa shows (few or numerous?) closely arranged ___________ similar to those in the small intestine

Answer 3

Numerous

tubular glands or crypts

Question 4

The mucosa of the large intestine is dissimilar

T/F

Answer 4

F

Question 5

Intestinal glands of the colon are (shorter or longer?) and (more or less?) closely packed than those in the small intestine

Answer 5

Longe

More

Question 6

The colon glands contain (few or numerous?) goblet cells, endocrine cells and in the (apical or basal?) half of the glands, proliferating and undifferentiated epithelial cells.

Answer 6

Numerous

Basal

Question 7

Colon

The mucous secreted by ____ cells serves as a _____ that facilitates the passage of (solid or liquid?) contents through the colon

Answer 7

Goblet

lubricant

semisolid

Question 8

Lamina propria of colon is the same as small intestine

T/F

Answer 8

T

Question 9

Colon submucosa

The submucosa of the colon is dissimilar to that of the small intestine

T/F

Answer 9

F

Question 10

Colon submucosa

Contains the (smaller or larger?) blood vessels and the ______ nerve plexus.

Answer 10

Larger

submucosal

Question 11

Presence of Glands in submucosa of the colon

T/F

Answer 11

F

Glands are not present.

Question 12

Colon of submucosa

Often lack fat cells.

Answer 12

F

Often contains fat cells

Question 13

Colon of submucosa

●Some cells that contain ___-(positive or Negative?) granules, termed ___, are also present.

●These are most numerous in the _______.

Answer 13

PAS-positive; muciphages

rectum

Question 14

Muscularis externa of colon

The outer, longitudinal coat of the muscularis externa of the cecum and colon differs from that of the small intestine in that it is collected into ____ (longitudinal or transverse?) bands called the _______

Answer 14

three

longitudinal

taeniae coli.

Question 15

Muscularis externa of colon

The inner circular layer is (complete or incomplete?) and is (similar or dissimilar?) to that of the small intestine.

Answer 15

Complete

Similar

Question 16

Muscularis externa of colon

Due to the tonus of the ______, the wall of the colon is gathered into (in or out?)wardly bulging pockets, the ____.

Answer 16

taeniae coli

Out ; haustra

Question 17

Colon serosa

The serosa is (complete or incomplete?) in the colon, as the _____ and _____ portions of the colon are retroperitoneal.
➢Here the muscular wall of the colon is attached to adjacent structures by ________

➢Where a serosa is present, it may contain (small or large?) , _____ lobules of fat called ________.

Answer 17

incomplete

ascending; descending

an adventitia.

Large

pendulous

appendices epiploicae

Question 18

Appendix Histological Features

➢The lumen is (small or large?) and (regular or irregular?) in outline, and taeniae coli are (present or absent?)

Answer 18

Small

Irregular

Absent

Question 19

The histological structure of the appendix resembles that of the _____, but in ______.

Answer 19

colon

miniature

Question 20

Appendix histological features

Absent of crypts
T/F

Answer 20

F

Presence of crypts but they are poorly formed

Question 21

Appendix histological features

➢The (longitudinal or circular ?) muscle coat is complete and equally (thin or thick?) all round.

Answer 21

Longitudinal

Thick

Question 22

Appendix Histological Features

The lamina propria is extensively infiltrated with _______, and details of the _____ often are ______ by the many _______ that may fill the _______ and ______

Answer 22

lymphocytes

Mucosa

obscured

lymphatic nodules

mucosa and submucosa.

Question 23

Rectum— Histological Features

➢Histologically similar to the colon except for the fact that:
➢A _______ coat of _____ muscle is present.

•taenia coli or no taenia coli

Answer 23

continuous

longitudinal

There are no taenia.

Question 24

Rectum—Histological Features

➢Peritoneum covers the _______ of the upper one-third of the rectum; and only the _____ of the middle third.

Answer 24

front and sides

front

Question 25

The Ana Canal

• about ___ cm long.
• The upper __ cm lined by mucous membrane,
• lower __ cm by skin.

•The area lined by mucous membrane can be further divided into an upper part (____) and a lower part (____).

Answer 25

4

3

1

15 mm

15 mm

Question 26

The Ana Canal

• The mucous membrane of the upper 15 mm of the canal is lined by _____ epithelium.
• The mucous membrane of this part shows ________ longitudinal folds that are called the ___________

Answer 26

columnar

six to twelve

anal columns.

Question 27

The Ana Canal

• The anal valves together form a transverse line that runs all round the anal canal: this is the _______ line.
• At the pectinate line, the ______ intestinal epithelium makes an abrupt transition to ______________________ epithelium.

Answer 27

pectinate

Simple columnar

noncornified stratified squamous

Question 28

The Ana Canal

•Beneath the epithelium of this pectinate line are (simple or complex ?) _____ ___crine ____ glands, the ____ glands

Answer 28

Simple

Tubular

Apocrine

Sweat

circumanal

Question 29

The Ana Canal

•The mucosa has a ____ appearance because of the presence of a (sparse or dense?) ____________ between it and the muscle coat.

Answer 29

bluish

Dense

venous plexus

Question 30

The Ana Canal

•The lowest 8 to 10 mm of the anal canal are lined by _____ in which _______, ____ glands and _____ glands are present.

Answer 30

true skin

hair follicles

sebaceous

Sweat