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Medical Term:

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

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