Constrictions of esophagus From Incisor tooth(as on endoscopy) Cricopharyngeal constricion-15cm(Narrowest part of GIT other than Appendix) Constriction at crossing of aortic arch-25cm Left main bronchus-28cm Diaphragmatic hiatus-40cm Sites of narrowing of ureter Uretero pelvic Junction Crossing of iliac artery Juxtaposition …