This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Anatomy
Structure passes through upper triangular space: 
Select and explain. 
A. Profunda brachii, B. Anterior circumflex humeral aery, C. Posterior circumflex humeral aery, D. Circumflex scapular aery
D: Circumflex scapular aery
Answer: D: Circumflex scapular aery 
Explanation: Upper Quadrangular spaceIt has the following boundaries:- the teres major inferiorly- the long head of the triceps laterallyFor the superior border, some sources list the teres minor, while others list the subscapularis.It contains the scapular circumflex vessels.