Triangle of auscultation

The triangle of ausculation is situated behind the scapula.

It is bounded above by the Trapezius, below by the Latissimus dorsi, and laterally by the vertebral border of the scapula; the floor is partly formed by the Rhomboideus major.

If the scapula be drawn forward by folding the arms across the chest, and the trunk bent forward, parts of the sixth and seventh ribs and the interspace between them become subcutaneous and available for auscultation (hence the name).

Doctors use it to listen to breathing because it can be heard more clear than other parts of the back due to the lack of many muscles underneath it.