Which of the following is the common side of fertilization?
A. Ampulla of fallopian tube
B. Infundibulum
C. Isthmic
D. Interstinal
Correct Answer: A. Ampulla of fallopian tube
Explanation
The most common site of fertilization in humans is the:
Ampulla of the fallopian (uterine) tube
This is the widest part of the oviduct and is where the sperm and egg typically meet.
Answer: Ampullary region of the fallopian tube
Other Options Details
Here are the descriptions of each option related to the parts of the fallopian (uterine) tube:
A. Ampulla of Fallopian Tube
• The widest and longest part of the fallopian tube.
• Lies between the infundibulum and isthmus.
• Most common site of fertilization (where sperm meets the ovum).
• Has numerous mucosal folds and thin walls.
B. Infundibulum
• The funnel-shaped distal end of the fallopian tube, closest to the ovary.
• Contains fimbriae, which are finger-like projections that help capture the ovulated egg from the ovary.
• Opens into the peritoneal cavity.
C. Isthmus
• The narrowest part of the fallopian tube (except for the interstitial portion).
• Located between the ampulla and the uterus.
• Has thick muscular walls and a narrow lumen.
• Plays a role in sperm and embryo transport.
D. Interstitial (or Intramural) Part
• The short segment of the fallopian tube that passes through the uterine (myometrial) wall.
• Opens into the uterine cavity.
• The narrowest section overall.
• Ectopic pregnancies here can be dangerous due to late rupture and severe bleeding.
Summary Table
Part Location Description Key Feature
Infundibulum Near ovary Funnel-shaped with fimbriae Captures ovum
Ampulla Middle and longest portion Wide lumen & folded mucosa Fertilization site
Isthmus Near uterus Narrow, thick-walled Transports embryo
Interstitial Within uterine wall Smallest portion Opens into uterus
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Writer: Vandita Singh, Lucknow (GS India Nursing Group)