Abdominal Cavity Embryology Flashcards
ectoderm
forms integument and nervous system, lining of anus and mouth
pectinate line
mesoderm
muscles, mesentaries, bone, connective tissue, blood
somatic (body wall) or splanchnic (lines organ)
endoderm
internal lining of gut and gut derived abdominal organs
umbilical vesicle
cranial-caudal folding
yolk sac forms week 2
-provides nutrients for 2 weeks
-primordial gut and forms gut tube and respiratory tract
-give rise to gonads
-blood develops here until liver functional
allantois
waste sac
vitelline duct + yolk sac
form gut tube
recanalization
process of vacules/holes developing in the lumen of gut tube after epithelial cells take over
failure often at duodenum
narrow lumen/stenosis
poor vacuole formation so only small hole
atresia/ no lumen
no vacuole form at all so complete blockage in lumen
esophageal development
tracheoesophageal fold divides future trachea and esophagus
fold fuses and splits tubes
polyhydramnios
excess liquid in amniotic sac
if have atresia then fluid can’t pass thru fetus like normal so have too much
normally drink sac fluid then pee out
stomach development
dorsal border grows faster than ventral = curvatures
rotates 90 degress clockwise and takes L. vagus with it so ventral (R vagus is dorsal)
L vagus does parasympathetics to gut cavity
pancreatic development
start as ventral and dorsal buds
rotation brings buds together so fuse into head/body/tail of pancreas
problem if bilobed & twists opposite into annular pancreas = blocks duo
splenic development
from mesoderm not endoderm
forms and grows in mesentary (primary)
umbilical folds
- median: urachus and paraumbilical veins
-urachus main drain tube of nitrogenous waste - medial: umbilical artery TO placenta, paired
- lateral: inferior epigastrics