Shoest and narrowest pa of fallopian tube:: (A) Interstitial, (B) Isthmus, (C) Ampulla, (D) Infundibulum
Answer is A. 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