Internal intercostal muscles
musculi intercostales interni
The interosseous portion depresses the ribs; the intercartilaginous portion elevates them. They act in forced expiration. They keep the intercostal spaces rigid.

In the full entry
The full entry, with every field, sources, quiz and clinical correlations, is in the atlas.
- Origin
- Insertion
- Innervation
- Blood supply
Related clinical cases
- Thoracotomy and the intercostal space