GI Week 3 Workbook Flashcards
overview of histological layers in GI
1.Mucosa
2.submucosa
3.muscularis externa
4. Serosa (or adventitia)
subdivisions of mucosa
a. Epithelium
b. Lamina propria- connective tissue
c. Muscularis mucosae (interna)
subdivisions of muscularis externa
a. Circular muscle
b. Longitudinal muscle
4 junctions in GI
- Gastro -oesophageal junction
- gastro-duodenal junction
- ileo-cecal junction
- Recto - anal junction
1.where is protective mucosa found
2.what does it look like
3.epithelium type
- oesophagus
2.closely packed straight glands with goblet cells
3.stratified squamous non keritinisng
1.where is secretory mucosa found
2.what does it look like
3.epithelium type
- stomach
- tubular glands
- simple collumnar
1.where is absorptive mucosa found
2.what does it look like
3.epithelium type
- large and small intestine
- villi with short glands in small, closely packed in large
3.Columnar epithelium
distribution of muscle type in oesophagus
top 1/3 = skeletal
middle = mixed
bottom 1/3 = smooth
What secretory cells are present in the stomach x3
chief- near bottom of gland
parietal- all of gland
surface mucous- top of pit
type of secretory cell in small intestine
and what they secrete
goblet
mucous
what are the crypts of Lieberkühn
Short tubular intestinal glands
what type of muscle is musuclaris mucosae
smooth
Where, in the gut tube, do glands extend down beyond the muscularis mucosae (interna) into the submucosa?
Oesophagus and duodenum
how to tell the difference between 1st and second part of duodenum
if brunners glands are in submucosa i.e after muscularis mucosa = 1st part
distinguishing features of jejunum
villi but no peyers patches or brunners glands
distinguishing feature of ileum
blue/purple payers patches
function of payers patch
immune surveillance
What is the predominant cell present in the surface epithelium of large intestine
goblet cells
structure of muscularis externa in large intestine
longitudinal thinner than circular
and is not continuous
appendix distinguishing features
the mucosa has no villi and fewer goblet cells compared to the colon
It has a ring of lymph follicles in the lamina propria.
Main histological features of the Pancreas
- Islets of Langerhans composed of clumps of small poorly stained cells
- Pure serous acini composed of large strongly stained cells
The spleen is covered by ……..
dense fibromuscular capsule formed of collagen and elastic fibres
with scattered smooth muscle.
where is this from
how can it be identified
epithelium type
oesophagus
Closely packed straight glands
with goblet cells- purple
stratified squamous non keratinising
where is this from
how can it be identified
epithelium type
stomach
tubular glands
simple columnar epithelium
where is this from
how can it be identified
epithelium type
small intestine
villi with short glands
simple columnar
where is this from
how can it be identified
epithelium type
large intestine
closely packed villi
Stratified squamous non-keratinised
whats this from
oesophagus
whats this from
stomach
whats this from
small intestine
whats this from
duodenum
whats this from- be specific
how can it be identified
small intestine- JEJUNUM
villi but no peyers patches or brunner glands
whats this from- be specific
how can it be identified
small intestine- ILEUM
lots of peyers patches- blue
whats this from
what are the gland things
colon
goblet cells- mucous secreting
whats this from
how can it be identified
appendix
no villi
fewer goblet cells
ring of lymph in the lamina propria.
whats this
how can you tell
what are the 2 types of epithelium in it
anorectal junction
epithelium changes halfway through
right side: simple columnar
left side: stratified squamous epithelium
whats this from
whats the hexagon shaped thing
whats the V
whats the T
and what does it contain
liver
hepatic lobule
central vein
portal triad
hepatic artery, a branch of the portal vein, and a bile duct.
what is this from
what is the red thing
pancreas
islet of langerhaun
whats this
how can you tell
spleen
very purple
name A
A = Crypts of Leiberkuhn
