Which of the following is the common site of fertilization?

Appeared in: AIIMS Patna NO - 2020

Explanation

The ampulla is the correct answer as it is the most common site of fertilization.
It is the longest and widest part of the fallopian tube, forming about two-thirds of its length (approximately 6-7 cm).
Its dilated and tortuous structure provides ample space and time for the sperm and oocyte to meet and fuse.
The mucosal folds are most prominent in the ampulla, which helps in nourishing the gametes and the early embryo.

Option A: The interstitial (or intramural) part is the segment of the fallopian tube that passes through the muscular wall of the uterus. Fertilization does not occur here.
Option B: The isthmus is the narrow, thick-walled portion of the tube that connects the ampulla to the uterus. While the fertilized egg passes through it, fertilization is not common in this section.
Option D: The infundibulum is the funnel-shaped opening near the ovary. Its primary role, with its finger-like fimbriae, is to capture the oocyte after ovulation. Fertilization is rare in this part.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Anatomy of the Fallopian Tube and Site of Fertilization as background academic context rather than a clinical decision trigger.
Understanding the site of fertilization is crucial for diagnosing and managing infertility and ectopic pregnancies.
The ampulla is the most common site for tubal ectopic pregnancies, a life-threatening condition where the fertilized egg implants outside the uterus. Nurses must be aware of the signs and symptoms, such as unilateral abdominal pain and vaginal bleeding.
Procedures like hysterosalpingography (HSG) are used to check the patency of the fallopian tubes, which is essential for natural fertilization to occur.

How to Approach the Question

First, identify the core question: it asks for the 'common site of fertilization'.
This is a direct factual recall question related to female reproductive anatomy.
Recall or visualize the structure of the fallopian tube, which consists of four parts extending from the uterus to the ovary.
Mentally list the parts in order: Interstitial (in the uterine wall), Isthmus (narrow part), Ampulla (wide part), and Infundibulum (funnel near the ovary).
Remember that fertilization requires space and a conducive environment. The ampulla is the widest and longest part, making it the most suitable location.
Select the option that matches this anatomical fact.

Concept Tested & Keywords

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E6 Anatomy Applied Ashalatha 4e p. 389-391

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