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abdominothoracic arch

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n.
A bell-shaped line along the lowest of the false ribs and the lower end of the sternum, making a rough boundary line between the abdomen and thorax.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

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