What are the divisions of the uterine tubes?

• A. Isthmus, Ampulla, Infundibulum
• B. Fundus, Body, Cervix
• C. Mucosa, Muscularis, Serosa
• D. Proximal, Medial, Distal

Answer: (A)

The uterine (fallopian) tubes are divided into three segments: the infundibulum, the ampulla, and the isthmus. The infundibulum is the funnel-shaped end near the ovary, with fimbriae that help capture the released oocyte into the tube. The ampulla is the widest, typically longest portion where fertilization most often occurs. The isthmus is the narrow section closest to the uterus, connecting the tube to the uterine cavity and aiding transport of the oocyte or zygote through its muscular contractions and ciliary action. The other options describe regions of the uterus, the wall layers of the tube, or generic directional terms, none of which are the actual divisions of the uterine tube.