Except at the triangle of auscultation, which is bounded by the Trapezius, Latissimus Dorsi, and Rhomboideus Major and overlies the sixth rib and the space above it and below it, the costae are completely covered with muscles.
Surgical Anatomy. Arch Surg. 1996;131(2):152. doi:10.1001/archsurg.1996.01430140042010
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