Embryo foregut Flashcards
epithelium and glands from which germ layer?
endoderm
musculature, connective tissue, and gut wall from?
splanchnic mesenchyme
splanchnic mesoderm in the abdominal cavity is the _____ peritoneum
visceral
what is mesentery?
double layer of visceral peritoneum (splanchnic mesoderm)
derivatives of foregut
primordial pharynx, lower respiratory system, esophagus, stomach, duodenum proximal to bile duct, liver, biliary apparatus, pancreas
blood supply to foregut (except pharynx, LRT, esophagus)
celiac trunk
musculature of esophagus
upper 1/3- skeletal
middle 1/3- skeletal and smooth
lower 1/3- smooth
esophagus innervation
vagus (primarily GSE and GVE)
tracho-esophageal atresia/fistula
failure of recanalization of esophagus or failure of TE septum to develop
stomach rotation
90 degrees clockwise
stomach location
upper left
congenital pyloric stenosis
no food into duodenum- projectile vomiting
dual supply of duodenum
celiac and SMA
does duodenum undergo recanalization?
yes
failure of recanalization of duodenum can result in
duodenal stenosis- vomiting of stomach contents with bile
duodenal atresia
duodenal atresia
blind ending- complete occlusion, no recanalization
associated with Down’s syndrome
see dilated duodenum- double bubble on CT
liver and biliary apparatus derived from what embryologic structure?
hepatic diverticulum
Cranial part of hepatic diverticulum develops into
liver
caudal part of hepatic diverticulum
gall bladder
bile duct is comprised of
hepatic and cystic duct
derivatives of ventral mesentery
lesser omentum- hepatoduodenal ligament, hepatogastric lig.
falciform lig.
coronary lig.
R and L triangular lig.
(liver stuff- except for bare area)
derivatives of dorsal mesentery
greater omentum (gastrophrenic, gastrolienal, gastrocolic)
lienorenal
transverse melsocolon
ventral and dorsal buds of pancreas
ventral swings posterior to duodenum to fuse with dorsal bud
annular pancreas
results from incorrect rotation of ventral bud
can wrap around duodenum leading to duodenal stenosis
2 things can result in duodenal stenosis
failure of recanalization
annular pancreas
4 borders of epiploic foramen
sup- liver
inf- duodenum
ant- hepatoduodenal lig.
post- abdominal wall (IVC)