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External Intercostal Muscles
Region: Chest Muscles · All chest muscles
External Intercostal Muscles at a glance
| Origin | Lower border of the rib above |
|---|---|
| Insertion | Upper border of the rib below, fibres running down and forward |
| Actions | Elevate the ribs, expanding the chest in quiet breathing in |
| Nerve supply | Intercostal nerves |
◆ Good to know
Their fibres run in the same direction as putting your hands into your pockets; the rib's neurovascular bundle shelters under the lower border of the rib 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.