A. axillary nerve locate in profound of deltoid by pass through Quadrangular space

B. fracture of surgical neck of humerus result in injury of axillary nerve,these would lead to parlaysed of deltoid muscle, which show off characteristic of "flattened shoulder"

C. muscular branch of axillary nerve innervate deltoid muscle and teres minor

D. deltoid region is occupy by deltoid muscle

E. axillary nerve together with scapular circumflex A. and V. reach to deltoid region by pass Quadrangular space