This site is intended for healthcare professionals

Go to /sign-in page

You can view 5 more pages before signing in


Last reviewed dd mmm yyyy. Last edited dd mmm yyyy

Authoring team

Subcostalis is one of the muscles of the thoracic wall. On each side, it is best developed between ribs six and twelve.

It arises from the internal border, lateral to the angle, of the superior rib in each intercostal space. The muscle slopes obliquely both inferiorly and dorsally. It inserts into the internal surface of the ribs one to three intercostal spaces caudally near to the angle of the rib.

It is innervated by the muscular collateral branches of the intercostal nerves and the subcostal nerve.

Subcostalis acts to depress the lower ribs, an action that is used in expiration.

Create an account to add page annotations

Add information to this page that would be handy to have on hand during a consultation, such as a web address or phone number. This information will always be displayed when you visit this page