Adductor canal

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Anatomical illustration of the adductor canal

The adductor canal—also known as the subsartorial canal or Hunter’s canal—is an aponeurotic tunnel in the middle third of the thigh that serves as a passageway for neurovascular structures traveling from the anterior compartment of thigh to the posterior knee. It extends from the apex of the femoral triangle to the adductor hiatus in the adductor magnus muscle.

Anatomy and Boundaries

The adductor canal is situated between the anterior and medial compartments of the thigh. It is bordered by:

• Anteriorly: the sartorius muscle.
• Posteromedially: the adductor longus and adductor magnus muscles.
• Laterally: the vastus medialis muscle.

The roof of the canal is formed by a strong aponeurosis extending from the vastus medialis to the adductor muscles, which provides protection to the structures within.

Contents

The adductor canal contains several key neurovascular elements:

• Femoral artery – Continues through the canal to become the popliteal artery.
• Femoral vein – Accompanies the artery and becomes the popliteal vein after exiting.
• Branches of the femoral nerve:
  • Saphenous nerve – A purely sensory branch innervating the medial leg and foot.
  • Nerve to vastus medialis – Motor innervation to the vastus medialis muscle.

Openings of the Canal

There are three important openings:

• Superior (Proximal) opening: Entry point from the femoral triangle.
• Anterior opening: Exit of the saphenous nerve and descending genicular artery through the vastoadductor intermuscular septum.
• Inferior (Distal) opening (adductor hiatus): Passage of the femoral vessels to the popliteal fossa.

Function

The adductor canal facilitates the transition of vascular and nervous structures from the anterior thigh to the posterior knee, supporting lower limb function and circulation.

Clinical Significance

• Adductor Canal Block: A technique in regional anesthesia that provides sensory blockade of the saphenous nerve, commonly used in post-operative pain management for knee surgeries.
• Compression Syndromes: Rarely, structures in the canal may be compressed, potentially leading to vascular insufficiency or deep vein thrombosis.
• Saphenous nerve entrapment: Can result in pain, paresthesia, or sensory loss along the medial leg.

Eponym

The canal is named Hunter’s canal after the Scottish anatomist and surgeon John Hunter, who first described it.

Additional Images

• Adductor canal dissection
  Adductor canal dissection
• Medial view of the adductor canal
  Medial view of the adductor canal

See Also

• Femoral triangle
• Sartorius muscle
• Adductor magnus
• Popliteal artery
• Saphenous nerve
• Lower limb anatomy

External Links

• UltrasoundBlock.com – Adductor Canal Block
• Anatomy photo:12:07-0103 at the SUNY Downstate Medical Center – "Anterior and Medial Thigh Region: Sartorius Muscle and the Adductor Canal"
• Anatomy photo:12:08-0105 at the SUNY Downstate Medical Center – "Anterior and Medial Thigh Region: Structures of the Adductor Canal"

Gray's Anatomy

• Gray's Anatomy Contents
• Gray's Anatomy Subject Index
• About Classic Gray's Anatomy
• Glossary of anatomy terms

Anatomy atlases (external)

[1] - Anatomy Atlases

Adapted from the Classic Grays Anatomy of the Human Body 1918 edition (public domain)