Spaces found in the musculature of the shoulder region can be tricky to learn. Watch this video to know all about their boundaries and the structures passing through, in a detailed and explanatory way. 0:04 quadrangular space 0:45 boundaries of quadrangular space 2:26 contents of quadrangular space 3:15 triangular space 3:24 contents of triangular space 3:32 boundaries of triangular space 4:30 triangular interval 4:37 contents of triangular interval 4:59 boundaries of triangular interval