Medial boundary of the femoral ring is formed by which ligament?

• A. Inguinal ligament
• B. Pectineal ligament
• C. Lacunar ligament
• D. Fascia lata

Answer: (C)

This question tests how the femoral ring is bounded. The femoral ring is the superior opening of the femoral canal and its borders define where a femoral hernia can protrude. The medial edge of that ring is formed by the lacunar ligament, a crescent-shaped band that arises from the inguinal ligament near the pubic tubercle and attaches to the pectineal line on the pubic bone. This lacunar ligament creates the sharp inner border of the ring, while the anterior border is the inguinal ligament and the posterior border is the pectineal (Cooper’s) ligament; the lateral border is the femoral vein. The fascia lata isn’t part of the ring’s boundaries.