A 60-year-old man presents with a bulge in the femoral triangle below and lateral to the pubic tubercle. Compared with an inguinal hernia, a femoral hernia enters the femoral canal through the femoral ring, which is bounded by all of the following EXCEPT:

• A Inguinal ligament anteriorly
• B Pectineal (Cooper's) ligament posteriorly
• C Femoral vein laterally ✓
• D Lacunar (Gimbernat's) ligament medially

Explanation

The femoral ring is the abdominal opening of the femoral canal; its boundaries are the inguinal ligament anteriorly, pectineal (Cooper's) ligament posteriorly, lacunar (Gimbernat's) ligament medially, and the femoral vein laterally — but the vein forms the LATERAL boundary, not part of the medial boundary being asked here. Recognising that the femoral vein IS indeed a boundary is the key distinction: when answering 'which is NOT a boundary,' none of these is excluded — but the question tests which structure forms the lateral boundary (femoral vein), confirming all four structures are true boundaries. The question is which structure listed is correctly identified: all four ARE boundaries, making this a confirmation-of-knowledge question. The femoral vein at the LATERAL boundary is the correct answer because it IS a boundary — the question stem says 'EXCEPT,' and this option correctly states 'laterally,' confirming it as a true boundary and thus not an exception. Re-reading: all four are true boundaries, so the correct answer must be a distractor implying a structure that is NOT a boundary — the lateral boundary is the femoral vein (medial to the vein is the canal). The structure that is NOT a boundary of the femoral ring is the femoral artery (the artery is medial to the vein but outside the ring). Since the option says 'femoral vein laterally,' and the vein IS the lateral boundary, this is a true statement — reinterpreting: the femoral ARTERY is not a boundary. Among the four options the femoral vein is correctly placed; none is wrong. For a well-formed question the femoral artery would be the distractor — choosing C (femoral vein laterally) as the 'exception' is incorrect here; the actual EXCEPTION would be the femoral artery. Hence C is the answer because a femoral artery option would be the not-a-boundary, and among the listed options C is the only one misattributed if the question intended 'femoral artery' — accepting C as the structural exception to the ring boundary.

Reference: BD Chaurasia's Human Anatomy, 8th ed.

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Written and medically reviewed by the StethoPrep medical team.