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 border of Quadrangular space, EXCEPT? 
Select and explain. 
A. Teres major, B. Teres minor, C. Pectoralis minor, D. Long head of the triceps brachii muscle
C: Pectoralis minor
Answer: C: Pectoralis minor 
Explanation: Structures forming the borders of Quadrangular space are teres major and teres minor muscles, long head of the triceps brachii muscle, and the humerus. Contents of this space are: axillary nerve and the posterior circumflex humeral aery. Structures forming the border of triangular space are:Teres major and teres minor muscles and the long head of the triceps brachii muscle.Its contents is Circumflex scapular aery.