| Serratus posterior inferior muscle | |
|---|---|
 Muscles connecting the upper extremity to the vertebral column (serratus posterior inferior labeled at center right). | |
 Serratus posterior inferior (red) seen from back. | |
| Details | |
| Origin | Vertebrae: Spinous processes of T11 - L2 |
| Insertion | The inferior borders of the 9th through 12th ribs |
| Artery | Intercostal arteries |
| Nerve | Intercostal nerves T9 through T12 |
| Actions | Depress the lower ribs 9-12, aiding in expiration |
| Identifiers | |
| Latin | musculus serratus posterior inferior |
| TA98 | A04.3.01.010 |
| TA2 | 2235 |
| FMA | 13402 |
| Anatomical terms of muscle | |
The serratus posterior inferior muscle, also known as the posterior serratus muscle,[citation needed] is a muscle of the human body.