In mapping the thoracic cage, the right midclavicular line, midsternal line, and left midclavicular line are references for the:

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These lines are used as anatomical landmarks on the anterior thorax to help in mapping out locations for assessment, such as in cardiac, respiratory, or breast examinations. The midsternal line runs down the middle of the sternum, while the right and left midclavicular lines drop vertically from the midpoint of each clavicle, all of which are on the front of the body.

In Mapping the Thoracic Cage, the Right Midclavicular Line, Midsternal