Fallopian Tube Anatomy Reference

By RRM Academy Reviewed by Dr. Naomi Whittaker, MD, Board-Certified OBGYN, MIGS, NFPMC, FCI Updated May 7, 2026

The fallopian tube has four anatomical segments, each relevant to RRM diagnosis and surgery:⁴⁶⁴⁷

• Interstitial (Intramural): Segment passing through the uterine wall, narrowest portion, most difficult to cannulate
• Isthmus: Narrow segment adjacent to the uterus; site of distal ligation in many sterilization procedures; most favorable for anastomosis reversal
• Ampulla: Widest, longest segment (5 cm, diameter up to 1 cm); most common site of fertilization and ectopic pregnancy⁴⁷
• Infundibulum / Fimbriae: Open, funnel-shaped distal end with finger-like fimbriae that sweep the ovulated egg into the tube; damage here causes hydrosalpinx

This content is for educational purposes only and does not constitute medical advice. Consult an RRM clinician or healthcare provider for guidance specific to your situation.