Development of the Digestive System I Flashcards
What are the 3 primitive gut formations?
Foregut
Midgut
Hindgut
What does the foregut give rise to?
Pharynx Lower respiratory tract Oesophagus Stomach Duodenum Liver Pancreas Biliary apparatus
What does the oesophagus seperate from?
Laryngotracheal tube
How does the oesophagus seperate from the laryngotracheal tube?
By the tracheoesophageal septum
What can defects (fistula) of the tracheooesophageal septum lead to?
Oesophageal atresia and incomplete seperation of the oesophagus from the laryngotracheal tube
What does the stomach develop from?
Dilation of the primitive gut
What degree of rotation does stomach undergo?
90 degrees
What defect can occur from the narrowing of the passage between the stomach and small bowel?
Congenital pyloric stenosis - projectile vomiting
What ratio of men to women get congenital pyloric stenosis?
1: 150 M
1: 750 F
What does the midgut give rise to?
Small intestine
Caecum and vermiform appendix
Ascending colon
Most transverse colon
What rotates as a result of the midgut forming?
Umbilical cord by 90 degrees
What week does the umbilical rotate and what is the total rotation it goes through?
Week 5
and 270 degrees in total
What can defects of mid-gut extension lead to?
Omphalocoele/ umbilical hernia
What can defects of rotation lead to?
Malrotation and congenital high caecum
What does the hindgut give rise to?
Left transverse colon Descending colon Sigmoid colon Rectum Superior anal canal Epithelium of U. Bladder Urethrs
