<prompt> All are true about intermuscular spaces exceptThe superior boundary of quadrangular intermuscular space is formed by the inferior margin of the subscapularis muscleThe medial boundary of quadrangular internmuscular space is formed by the lateral margin of the long head of the triceps brachii muscleThe lateral boundary of upper triangular intermuscular space is formed by the medial margin of the long head of the triceps brachii muscleThe lateral boundary of lower triangular intermuscular space is formed by the lateral margin of the long head of the triceps brachii muscle  <response>: The medial boundry of lower triangular intermuscular space is formed by the lateral margin of the long head of the triceps brachii muscle and lateral boundry by the shaft of Humerus. 