In which region of the fallopian tube does fertilization take place?

Concept

The fallopian tube has four anatomical regions: infundibulum, ampulla, isthmus, and uterine part.

Fertilization normally occurs in the ampullary region, often described more precisely as the ampullary–isthmic junction, where sperm and the secondary oocyte meet.

Application

The stem asks for the named region among the supplied choices.

The standard regional answer, also used in the official BPSC key for this item, is the ampulla.

Contrast

• Infundibulum: its fimbriae receive the ovulated oocyte.

• Isthmus: this is the narrower medial segment leading toward the uterus.

• More than one of the above: this would require at least two separately named regions to satisfy the stem.

• None of the above: the ampulla is explicitly present among the choices.

Cross-check

Anatomy references identify the ampulla as the usual or most common site of fertilization; this agrees with the official BPSC answer key.

Result

Therefore, fertilization takes place in the ampulla.