internal intercostal (muscle)

(redirected from musculus intercostalis internus)

in·ter·nal in·ter·cos·tal (mus·cle)

[TA]
flat muscle of thorax arising from lower border of rib and passes obliquely downward and backward to be inserted into upper border of rib below; action, contract during expiration, also maintain tension in the intercostal spaces to resist mediolateral movement; nerve supply, intercostal.
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