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development of the digestive system - Coggle Diagram
development of the digestive system
primitive gut tube
formed from the incorporation
of dorsal yolk sac into embryo
due to craniocaudal & lateral folding
midgut
sup mesenteric artery
hind gut
inf mesenteric artery
foregut
celiac artery
DERIVATIVES OF FOREGUT
upper duodenum
liver
haptic cords
of hepatic diverticulum grow into mesoderm
hepatic cords surround
vitelline veins & umbilical veins
form
hepatic sinus
formed from hepatic diverticulum projecting into surrounding mesoderm
liver bulges forming
ventral mesentary
=
falciform lig + lesser omentum
falciform contain
L umbilical vein
regresses to
liamentum teres
after birth
lesser omentum = hepatogastric ligament +
hepatoduodenal ligament
hepatoduodena =
portal triiad
hematopoyetic function week 10
stomach
week 4 fusiform
primitive stomach
rotates 90º clockwise
dorsal mesentery carried to L & forms grater omentum
L vagus nerve innervates ventral
R vagus innervates dorsal
oesophagus
tracheoesophageal folds
fuse to form tracheo-esophageal septum
gall bladder & bile ducts
outgrowth from bile duct = gallbladder & cystic duct
narrowing of connection = bile duct
pancreas
exocrine
endodermal tubules
form
acincar cells & ducts
endocrine
clumps of endodermal cells
form islet cells
ventral bud → head
dorsal bud → head, body & tail
endoderm
epithelial lining of digestive system
estroma → splacnic mesoderm
parequima
hepatocytes
endocrine cells
DERIVATIVES OF MIDGUT
midgut loop/ 6 weeks
cranial limb
Jejunum
Ileum upper
caudal limb
Ileum lower
cecum
appendix
ascending colon
proximal 2/3 of transverse colon
rotates 270º counterclockwise
around mesenteric artery
lower duodenum
DERIVATIVES OF HINDGUT
terminal end
cloacal
divided by urorectal septum
upper anal canal
urogenital sinus
rectum
cranial end
1/3 of transverse colon
descending colon
sigmoid colon
proctodeum
lower anal canal
mesenteries
ventral
adult = lesser omentum
dorsal
adult = grater omentum