Which of the following does NOT contribute to forming the adductor (subsartorial) canal?

Question

BlackTom AI · Accepted Answer

The adductor (subsartorial or Hunter’s) canal is a fascial tunnel in the middle third of the thigh, bounded by specific muscles and aponeurotic structures.

1) Relevant knowledge points and concepts
- The adductor canal runs from the apex of the femoral triangle to the adductor (hiatus) in the adductor magnus.
- Its roof is formed by sartorius and the subsartorial (scarpa’s) fascia/vastoadductor membrane.
- The lateral wall is provided by the vastus medialis.
- The posterior/medial wall (floor) is formed by adductor longus proximally and adductor magnus distally.
- Contents include the femoral artery and vein, saphenous nerve, and the nerve to vastus medialis.

2) Step-by-step reasoning
- Identify the possible contributors from the options: Sartorius, Vastus lateralis, Adductor longus, Vastus medialis.
- Match each muscle to known canal boundaries.
  - Sartorius: lies superficial and forms the roof of the canal — contributes.
  - Vastus medialis: lies on the anterolateral/lateral side of the canal and forms the lateral wall — contributes.
  - Adductor longus: forms part of the floor/posteromedial boundary — contributes.
  - Vastus lateralis: lies on the lateral side of the thigh but more lateral/anterior than vastus medialis and does not form a boundary of the adductor canal.

3) Intermediate anatomical clarifications
- The canal is under sartorius; the vastoadductor membrane (between vastus medialis and adductor longus/magnus) completes the tunnel. Vastus lateralis is lateral to vastus medialis and does not contact the canal.

4) Why the correct answer is correct
- Vastus lateralis does NOT contribute to forming the adductor canal because it is positioned more laterally on the thigh and is not part of the canal’s walls, roof, or floor.

5) Why the other options are incorrect
- Sartorius: incorrect to select as non-contributor because it forms the roof.
- Adductor longus: incorrect to select because it forms the posterior/medial floor proximally.
- Vastus medialis: incorrect to select because it forms the lateral wall.

6) Conclusion
- Therefore, the muscle that does NOT contribute to forming the adductor (subsartorial) canal is Vastus lateralis, matching the provided answer.

Which of the following does NOT contribute to forming the adductor (subsartorial) canal?单项选择题

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