Which portion of the fallopian tube is widest, longest, and most coiled, and is the common site of fertilization?

Which portion of the fallopian tube is widest, longest, and most coiled, and is the common site of fertilization?

• A. Infundibulum
• B. Ampulla
• C. Isthmus
• D. Interstitial

Answer: (B)

Fertilization typically happens in the ampulla, which is the widest, longest, and most coiled portion of the fallopian tube. This region provides a generous surface area and the right environment for sperm to meet the ovulated oocyte and for the resulting zygote to begin its journey toward the uterus. The infundibulum, with its fimbriae, helps capture the oocyte but is not the site where fertilization occurs. The isthmus is narrower and more muscular, acting mainly as a conduit to the uterus, while the interstitial portion passes through the uterine wall and opens into the uterine cavity.

Fertilization typically happens in the ampulla, which is the widest, longest, and most coiled portion of the fallopian tube. This region provides a generous surface area and the right environment for sperm to meet the ovulated oocyte and for the resulting zygote to begin its journey toward the uterus. The infundibulum, with its fimbriae, helps capture the oocyte but is not the site where fertilization occurs. The isthmus is narrower and more muscular, acting mainly as a conduit to the uterus, while the interstitial portion passes through the uterine wall and opens into the uterine cavity.