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GIT- Embryology

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drnieves's version from 2017-06-20 00:05

Section

Question Answer
ForegutPharynx to doudenum. Create pancreas.
MidgutDuodenum to proximal 2/3 of transverse colon
HindgutDistal 1/3 transverse colon to anal canal above pectinate line
Failure of rostral fold closuresternal defects
lateral fold closureemphalocele, gastroschisis
Caudal fold closureBladder extrophy
Duodenal atresiaFailure to recanalize (trisomy 21)
Jejunal, ileal, colonic atresiavascular accident (apple peel atresia)
Midgut development 6th wherniates through umbilical ring
Midgut development 10th wReturns to abdominal cavity + rotates around SMA.
GastroschisisExtrusion of abdominal contents through abdominal folds; not covered by peritoneum.
OmphalocelePersistence of herniation of abdominal contents into umbilical cord, sealed by peritoneum
MC tracheoesophageal anomalyEsophageal atresia + distal tracheoesophageal fistula (allows air to enter stomach)
Tracheoesophageal anomalies sxDrooling, vomiting with first feeding.
Tracheoesophageal testfailure to pass nasogastric tube into stomach.
Cyanosis in TEF2ry to laryngospasm (to avoid reflux related aspiration).
Esophageal atresiaGasless stomach
Congenital pyloric stenosisObstruction due to hypertrophy of pylorus.
Congenital pyloric stenosisPalpable olive mass in epigastric region Non bilious projectile vomiting 2-6 w== hypokalemic hypochloremic metabolic alkalosis
Treatment of pyloric stenosisSurgical incision= pyloromyotomy.
Ventral pancreatic budsuncinate process, head and main pancreatic duct.
Dorsal pancreatic budHead, body, tail, isthmus and accessory duct.
Annular pancreasVentral pancreatic bud encircles 2nd part of duodenum. Newborn sx
Pancreas divisumVentral and dorsal parts fails to fuse at 8 weeks
pancreas divisumChronic abdominal pain and/or pancreatitis.
SpleenFrom mesentery (mesoderm). supplied by foregut (Celiac a.)
Ventral pancreatic ductcontribute to uncinate process and main pancreatic duct.
Dorsal pancreatic ductbody, tail, isthmus, and accessory pancreatic duct.
Pancreatic headventral + dorsal duct
Annular pancreasVentral duct abnormally encircles 2nd part od duodenum
Pancreas divisorventral and dorsal duct fail to fuse at 8 w. Chronic abdominal pain and pancreatitis.
Spleenfrom mesentery. Supplied by foregut.
3rd part of duodenumcourses horizontally across abdominal aorta and IVC at L3. SMA lie anterior to duodenum.
Direct inguinal herniaThrough triangle of Hasselbach. Medial to inferior epigastric a. Through superficial inguinal ring, covered by external spermatic fascia. Older men.
memorize

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