Retropectoralis Minor Space

Retropectoralis minor space

The retropectoralis minor space, also called the subpectoral or pectoralis minor space, lies behind the pectoralis minor tendon just below the coracoid process. The cords of the brachial plexus and the axillary artery and vein pass beneath the tendon here on their way into the arm.

Anatomical Data

Boundaries & Contents

Location	Upper anterior chest wall, deep to pectoralis minor near the coracoid.
Boundaries	Pectoralis minor anteriorly Ribs 2-4 and serratus anterior posteriorly Coracoid process above and laterally
Contents	Cords of the brachial plexus Second part of the axillary artery Axillary vein

Biomechanics

Function & Actions

Provides passage for the neurovascular bundle of the upper limb under the pectoralis minor.

Clinical Relevance

Clinical Notes

This is the third site of neurovascular compression in thoracic outlet syndrome, especially when the arm is raised and the vessels and nerves are stretched around the tendon. A tight or shortened pectoralis minor is treated by stretching or, rarely, surgical tenotomy.

Pathology

Common Injuries & Conditions

Pectoralis Minor Syndrome

Compression of the brachial plexus cords and axillary vessels under a tight pectoralis minor, causing arm pain and tingling when the arm is raised.

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