GI histo

Question 1

top 4

Answer 1

L to R

Muscularis mucosae

lamina propria

epithelium

lumen

Question 2

Answer 2

esophagus

top is strat squamous

then go down to all the different layers

Question 3

Answer 3

esophagus stratified squamous epithelium

Question 4

Answer 4

Gastroesophageal Junction

(squamo-columnar junction)

Stomach is on the L – notice the abrupt transition (this is the arrow) but ONLY epithelium changes!!!

Question 5

Answer 5

overall: fundic
1: folveolar
2: parietal
3: chief
4: muscularis mucosa

Question 6

Answer 6

folveolar cells lining gastric pits in stomach

Question 7

Answer 7

mucous neck cells

Question 8

Answer 8

parietal cells

think fried egg

Question 9

Answer 9

chief cells (mostly)

Question 10

Answer 10

villi with base called crips

note that crip is 1/3 or 1/4 height

Question 11

Answer 11

small intestine

v= villi, SM = submucosa M- mucosa

Question 12

Answer 12

villus tip

whisps of muscle from muscularies mucosae so it can stand up

also notice microvillar membrane - brush border

Question 13

Answer 13

columnar cells EM, microvillar membrane more obvious here

black little dots are mitochondria (cells need energy for digestion)

IC = intercellular clefts

Question 14

Answer 14

brush border (microvillar membrane)

has enzymes here - ex lactase functions for lactose digestion

Question 15

Answer 15

brush border again

actin filaments give structural integrity

Question 16

Answer 16

intercellular clefts, notice chylomichrons

Question 17

Answer 17

goblet cells

Question 18

Answer 18

paneth cells

Question 19

Question 20

Answer 20

under muscularis mucosa, to the R of picture

Question 21

Answer 21

brunners glands, submucosal

Question 22

Answer 22

peyer’s patches

Question 23

Answer 23

epithelium of colon, note no villi

Question 24

Answer 24

colonic mucosa

Question 25

Answer 25

colon

Question 26

Answer 26

Anal Canal (squamo-columnar junction)