The quadrangular (quadrilateral) space of the axilla contains which pair of structures?

• A Radial nerve and profunda brachii artery
• B Axillary nerve and posterior circumflex humeral artery ✓
• C Suprascapular nerve and suprascapular artery
• D Circumflex scapular artery and lower subscapular nerve

Explanation

The quadrangular space is bounded superiorly by teres minor, inferiorly by teres major, medially by the long head of triceps and laterally by the surgical neck of the humerus. Its contents are the axillary nerve and the posterior circumflex humeral artery and vein. The radial nerve and profunda brachii pass through the triangular interval below, while the suprascapular structures lie above the scapula near the suprascapular notch.

Reference: Gray's Anatomy for Students, 4th ed.

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