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external intercostal (muscle)

 

Definition: flat muscle of thorax arising from lower border of one rib and passing obliquely downward and forward to be inserted into the upper border of rib below; action, contract during inspiration to elevate ribs; also to maintain tension in the intercostal spaces to resist inward movement during inspiration; nerve supply, intercostal.

Synonym(s): musculus intercostales externiTA

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© Copyright 2017 Wolters Kluwer. All Rights Reserved. Review Date: Sep 19, 2016.
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