A surgeon approaches the surgical neck of the humerus from behind and identifies the boundaries of the quadrangular space. Which neurovascular pair passes through this space?

• A Radial nerve and profunda brachii artery
• B Musculocutaneous nerve and anterior circumflex humeral artery
• C Suprascapular nerve and circumflex scapular artery
• D Axillary nerve and posterior circumflex humeral artery ✓

Explanation

The quadrangular space is bounded by subscapularis above, teres minor above and teres major below, the long head of triceps medially and the humeral shaft laterally. It transmits the axillary nerve and the posterior circumflex humeral artery together. The radial nerve with profunda brachii passes through the triangular interval below, and the circumflex scapular artery passes through the triangular space medial to the long head of triceps.

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

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