Which structures pass through the quadrangular space of the axilla?
- A Suprascapular nerve and suprascapular artery
- B Radial nerve and profunda brachii artery
- C Axillary nerve and posterior circumflex humeral artery ✓
- D Circumflex scapular artery and thoracodorsal nerve
Correct answer: C. Axillary nerve and posterior circumflex humeral artery
Explanation
The quadrangular space is bounded by subscapularis above, teres minor above, teres major below, the long head of triceps medially and the surgical neck of the humerus laterally. It transmits the axillary nerve and the posterior circumflex humeral artery. The radial nerve and profunda brachii instead pass through the triangular interval, killing option B.
Reference: Gray's Anatomy for Students, 4th ed.
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