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Internal Intercostal Muscles
Region: Chest Muscles · All chest muscles
Internal Intercostal Muscles at a glance
| Origin | Lower border of the rib above (costal groove) |
|---|---|
| Insertion | Upper border of the rib below, fibres running down and backward |
| Actions | Depress the ribs during forced breathing out |
| Nerve supply | Intercostal nerves |
◆ Good to know
They lie at right angles to the external intercostals; chest drains are inserted just above a rib to avoid the bundle in the costal groove above.
More Chest Muscles
Please note: This page is an anatomy education summary for students and curious readers, not medical advice. Attachment points are given in their classic short form; individual anatomy varies, and detailed dissection-level descriptions belong in an anatomy atlas.