Which structures course through only a portion of the adductor canal?

Which structures course through only a portion of the adductor canal?

• A. Descending genicular vessels only
• B. Saphenous nerve, nerve to vastus medialis, descending genicular vessels
• C. Saphenous nerve only
• D. Femoral artery and vein

Answer: (B)

Adductor canal ( Hunter’s canal) carries vessels and nerves from the thigh toward the knee, but not all of them travel the entire length of the tunnel. The femoral artery and vein run throughout the canal and continue through the adductor hiatus to become popliteal vessels, so they truly course through the whole canal. The other contents—saphenous nerve, nerve to vastus medialis, and descending genicular vessels—are better thought of as projectors to knee and leg structures. The saphenous nerve enters the canal with the vessels but exits distally to become the cutaneous nerve on the medial leg, so it does not traverse the entire canal. The nerve to vastus medialis also travels within the canal to give motor branches to the vastus medialis and then leaves toward the muscle, not staying for the canal’s full length. The descending genicular vessels originate from the femoral artery within the canal and head to the knee region, with branches diverging before the canal ends, rather than continuing all the way through to the adductor hiatus. Thus, the structures that course through only a portion of the adductor canal are the saphenous nerve, the nerve to vastus medialis, and the descending genicular vessels.

Adductor canal ( Hunter’s canal) carries vessels and nerves from the thigh toward the knee, but not all of them travel the entire length of the tunnel. The femoral artery and vein run throughout the canal and continue through the adductor hiatus to become popliteal vessels, so they truly course through the whole canal.

The other contents—saphenous nerve, nerve to vastus medialis, and descending genicular vessels—are better thought of as projectors to knee and leg structures. The saphenous nerve enters the canal with the vessels but exits distally to become the cutaneous nerve on the medial leg, so it does not traverse the entire canal. The nerve to vastus medialis also travels within the canal to give motor branches to the vastus medialis and then leaves toward the muscle, not staying for the canal’s full length. The descending genicular vessels originate from the femoral artery within the canal and head to the knee region, with branches diverging before the canal ends, rather than continuing all the way through to the adductor hiatus.

Thus, the structures that course through only a portion of the adductor canal are the saphenous nerve, the nerve to vastus medialis, and the descending genicular vessels.