GI Large Intestine Flashcards
LI distinctive features
teniae coli
haustra
omental appendices
lack of villi
crypts of lieberkuhn structure
straight and tubular
paneth cells in LI
few to none
pericryptal fibroblast sheath
fibroblast population of regularly replicating cells
differentiate into macs
GALT in LI
no paneth
more nodules and lymphocytes in LP
(especially distally)
ME in LI
longitudinal layer is thinner than inner circular layer (except tenia coli)
contraction in LI
segmentation (local - mix)
peristalsis (move distally)
appendix characteristics
uniform layer of longitudinal muscle in ME
large # of lymph nodes
appendicitis mech
narrow opening
if nodules inflame –> appendicitis
rectum structure
straight tubular glands
tons of goblet cells
transverse rectal folds
anal structure
columns
sinuses
rectal/anal zones
colorectal
anal transitional
squamous
anal sphincter musculature
internal SM
external skeletal
anal canal distinctive features
mucosa: MM disappears around transitional zone
sub: rectal artery/venous plexus end
no teniae coli
glands of anal canal
anal glands
circumanal glands
sebaceous glands
internal hemorrhoids
veins in submucosa of anus enlarge under pressure
anal gland structure
branched straight tubular
fistulas
false opening between peritoneal skin and anal canal
formed from anal glands
crohn’s disease cause
immune system + heredity
crohn’s Sx
diarrhea abdominal pain cramping blood in stool weight loss lesions
crohn’s Dx
small bowel xray
CT
capsule endoscopy
crohn’s Tx
anti-inflammatory drugs immune system suppressors antibiotics anti-diarrheals laxatives pain relievers, iron, B12, surgery
crohn’s histo
lesions
cobblestone appearance
narrowing of lumen
