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On the front of the thorax, one of the most important[according to whom?] vertical lines is the midsternal line, the middle line of the sternum.

Midsternal line
Illu thoracic cage.jpg
Thoracic cage
Surface lines of the front of the thorax and abdomen. (Midsternal line not labeled, but is visible at center, running vertically.)
Anatomical terminology

It can be interpreted as a component of the median plane.

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This article incorporates text in the public domain from page 1309 of the 20th edition of Gray's Anatomy (1918)

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