<prompt> All of the following structures forms the border of Quadrangular space, EXCEPT?Teres majorTeres minorPectoralis minorLong head of the triceps brachii muscle  <response>: 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. 