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
All of the following structures forms the boundaries of the quadrangular space which is present under the deltoid muscle in the shoulder region, from the posterior side, EXCEPT? 
Select and explain. 
A. Teres minor, B. Teres major, C. Surgical neck of humerus, D. Long head of biceps brachii
D: Long head of biceps brachii
Answer: D: Long head of biceps brachii 
Explanation: Structures forming the boundaries of the quadrangular space from the posterior side are:Superiorly by teres minorInferiorly by teres majorLaterally by surgical neck of humerusMedially by long head of triceps brachiiContents of the quadrangular space are:Axillary nervePosterior circumflex humeral vesselsSagging pa of shoulder joint capsule.