<prompt> Shoest and narrowest pa of fallopian tube:InterstitialIsthmusAmpullaInfundibulum  <response>: Pas of the fallopian tube Interstitial pa: shoest, internal diameter 1mm narrowest Isthmus:35 mm long, lumen diameter 2-3 mm Ampulla: 60-75 mm long, widest . Feilisation takes place here Infundibulum: where abdominal ostium opens into the peritoneal cavity 