Which set of structures correctly describes the boundaries of the quadrangular space of the shoulder?

• A Teres minor above, teres major below, long head of triceps medially, surgical neck of humerus laterally ✓
• B Subscapularis above, teres major below, short head of triceps medially, coracobrachialis laterally
• C Teres minor above, teres major below, lateral head of triceps medially, long head of triceps laterally
• D Infraspinatus above, latissimus dorsi below, long head of triceps medially, acromion laterally

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. It transmits the axillary nerve and the posterior circumflex humeral artery, explaining why a surgical neck fracture injures the axillary nerve. Option C reverses the position of the triceps heads and omits the humerus.

Reference: Snell's Clinical Anatomy by Regions, 10th ed.

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