(Solved)Gastrointestinal USMLE Step 1 :Updated A+ Score Solution

Foregut (Ans- Pharynx to duodenum Midgut (Ans- Duodenum to proximal 2/3 of transverse colon Hindgut (Ans- Distal 1/3 of transverse colon to anal canal above pectinate line Abnormal Rostral Fold Closure (Ans- Developmental defect of anterior abdominal wall that leads to STERNAL DEFECTS Abnormal Lateral Fold Closure (Ans- Developmental defect of anterior abdominal wall that leads to OMPHALOCELE, GASTROSCHISIS Abnormal Caudal Fold Closure (Ans- Developmental defect of anterior abdominal wall that leads to BLADDER EXSTROPHY Duodenal atresia (Ans- Failure to recanalize [Trisomy 21] Jejunal, Ileal, Colonic atresia (Ans- Due to vascular accident [Apple Peel Atresia] Midgut development (Ans- 1. 6th week = Midgut herniates through umbilical ring 2. 10th week = Returns to abdominal cavity + ROTATES around SUPERIOR MESENTERIC ARTERY [SMA]