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35 Cards in this Set

  • Front
  • Back
What structures are foregut derivatives?
upper duodenum
What structures are midgut derivatives?
lower duodenum
ascending colon
prox 2/3 of transverse colon
What structures are hindgut derivatives
distal 1/3 of transverse colon
descending colon
sigmoid colon
upper anal canal
What BV supplies the foregut structures?
celiac artery
how is the primitive gut tube formed?
incorporation of part of the yolksac into embryo during craniocaudal and lateral folding
in the primitive gut tube what is derived from endoderm?
epithelium lining glands of mucosa
in the primitive gut tube, what is derived from mesoderm?
lamina propria
musculari mucosa
muscularis externa
formation of the esophagus?
tracheoesophageal septum divides the trachea from esophagus
pathogenesis of esophageal atresia?
esophagus ends in a blind tube as a result of malformed tracheoesophageal septum
Assoaciated with polyhydramnios and tracheoesophageal fistula
when does stomach form
week 4
how does the stomach form?
develops out of a fusiform dilation from the foregut
formation of the liver?
hepatic diverticulum sends out hepatic cell cords into the septum transversum
As the liver bulges, the septum transversum stretches and becomes the ventral mesentary (also plays a role in forming diaphragm)
How does the bile duct form?
connection between hepatic diverticulum and foregut narrows to form bile duct
how does gallbladder form?
outgrowth from bile duct gives rise to gallbladder and cystic duct
extrahepatic biliary atresia
pathogenesis and clinical presentation
incomplete recanalization --> occlusion of biiary ducts
jaundice soon after birth, pale stool, dark urine
formation of the pancreas
ventral pancreatic bud --> uncinate process and part of the head of the pancreas
dorsal pancreatic bud --> rest of head, body and tail
where do acinar cells derive from?
duct epithelium?
islet cells?
al from endoderm
what is annular pancreas?
ventral and dorsal pancreatic buds --> ring around duodenum --> duodenal obstruction
what is macrosomia? pathogenesis?
increased birthweight
fetal islet cells are exposed to high glucose (seen in DM in mom), glucose freely crosses placenta and stimulates fetal insulin secretion --> increased fat and glycogen deposition in fetal tissue
What BV supplies the midgut derivatives
where does the lower portion of the duo develop from?
cranial portion of the midgut
pathogenesis of duodenal atresia? Clinical presentation?
failed recanalization of the duo lumen
associated with polyhydramnios; bile-containing vomitus, distended stomach
formation of all of midgut (except for lower duo)
at 6 weeks, midgut loop herniates through primitive umbilicus ring --> physiologic umbilical herniation
at week 11, midgut rotates 270 degrees around SMA, returning to abdominal cavity and reducing physiologic umbilical herniation
midgut loop fails to return to abdominal cavity
see light gray shiny sac attached to umbilicus
Meckel's diverticulum
persistence of vitilline duct --> blind pouch between intestinal lumen and outside of body at umbilicus
clinical presentation of Meckel's diverticulum
fecal discharge from umbilicus
what is malrotation of midgut? what can it be associated with?
midgut undergoes partial rotation --> abnormal position of abdominal viscera
assciation with volvulus (twisting of intestines) --> compromised blood flow and gangrene
what are distal transverse colon, descending colon, and signmoid colon formed from?
cranial end of the hindgut
what BV supplies hindgut structures
pathogenesis of Hirschsprung's disease
clinical presentation
failure of neural crest cells to form myenteric plexus in sigmoid colon and rectum
loss of peristalsis, fecal retention, abdominal distention
what is the terminal end of the hindgut called
how is the cloaca partitioned? what results?
urorectal septum
rectum, upper anal cala, urogenital sinus
what is the lower anal canal derived from/
evagination of surface ectoderm (called proctodeum)
junction between upper adn lower anal canal --> anal membrane, marked by pectinate line in adult
pathogenesis of anorectal agenesis
rectum ends in blind pouch above puborectali muscle
associated with rectovesical fistula, rectourethral fistula, or rectovaginal fistula
what is anal agenesis
whne anal canal ends as blind sac below puborectalis muscle
--> recto vesical fistula, rectourethral fistula, rectovaginal fistula