Master Of Medicine

Constrictions of esophagus

From Incisor tooth(as on endoscopy)

1. Cricopharyngeal constricion-15cm(Narrowest part of  GIT other than Appendix)
2. Constriction at crossing of aortic arch-25cm
3. Left main bronchus-28cm
4. Diaphragmatic hiatus-40cm

Sites of narrowing of ureter

1. Uretero pelvic Junction
2. Crossing of iliac artery
3. Juxtaposition of vasdeferens/broad ligament
4. Uretero vesical junction
5. Ureteric Orifice

Esophagus has 4 areas of constriction whereas ureter has 5.

Cricopharyngeal sphincter=Ureteropelvic jn

Crossing of arch of aorta=Crossing of iliac artery

Left main bronchus=vasdeferens/broad ligament

Diaphragmatic hiatus=Ureterovesical jn.

Cricopharyngeal sphincter is the commonest site of foreign body