external intercostal muscle

(redirected from musculus intercostalis externus)

ex·ter·nal in·ter·cos·tal mus·cle

(eks-tĕr'nal in'tĕr-kos'tăl mŭs'ĕl)
Flat muscle of thorax arising from lower border of one rib and passing obliquely downward and forward to be inserted into upper border of rib below; action, contracts during inspiration to elevate ribs; also serves to maintain tension in intercostal spaces to resist inward movement during inspiration; nerve supply, intercostal.
Synonym(s): musculus intercostalis externus.
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