Medical Definition of Internal intercostal muscle
1.
Each arises 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.
Synonym: musculus intercostalis internus.
(05 Mar 2000)
Lexicographical Neighbors of Internal Intercostal Muscle
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