NME 2.9 Flashcards
where does liver originate from?
- endodermal epithelium
when does liver originate?
- 3 to 4 weeks
cranial part or caudal part form liver?
- cranial part
cranial part or caudal part form gallbladder?
- caudal part
what deos liver grow into?
- septum transversum
what does the septum transversum form?
- ventral meogastrium
when does pancreas development occur?
- 5 weeks
what happens during rotation of duodenum?
- the right ventral bud moves dorsally aroudn duodenum
- ventral bud not close contact with and below dorsal bud
what does ventral bud form?
- ucinate process
what does dorsal bud forms?
- superior part of the head, neck, body and tail
what is duct of wirsung?
- main pancreatic duct
- formed from distal dorsal pancreatic duct and entire ventral duct
what is teh duct of santorini?
- accessory pancreatic duct
- form from proximal dorsal duct
what happens to the duodenum on 2nd month?
- recanalization of lumen
what forms the striated muscle in upper oesophagus?
- pharyngeal arches
what forms the smooth muscle in lower oesophagus?
- surrounding mesenchyme
what helps separates trachea and oesophagus?
- tracheoesophageal septum
what is recanalization?
- lumen is widen so flow can be restored
what are the common abnormalities of oesophagus?
- oesophageal stenosis
- oesophageal artersia
- polyhydraminos
what causes polyhydramnios
- fetus with artersia unable to swallow amniotic fluid
- excess amniotic fluid
what causes hypertrophic pyloric stenosis?
- caused by the abnormal thickening of muscles of pylorus
what causes stenosis?
- insufficiently recanalization
what causes artersia?
- complete lack of recanalization
what are the biliary tree abnormalities?
- accessory hepatic ducts
- extrahepatic biliary artersia
what is annular pancreas?
- when the ventral bud split and forms a ring around the duodenum
- failure of fusion of dorsal and ventral ducts so dorsal duct become main duct
