The serratus posterior inferior arises from a thin tendinous sheet from the spinous processes of T11-L2 and inserts by four thin slips onto the lower borders and outer surfaces of ribs 9-12, just lateral to their angles. It is thought to pull the lower ribs down and back, possibly during forced expiration, although its respiratory role is uncertain. The aponeurotic origin blends with the thoracolumbar fascia.
| Muscle | |
|---|---|
| Attachment | Spinous processes of T11-L2 (origin), lower borders of ribs 9-12 (insertion) |
Thought to depress the lower ribs
Serratus posterior inferior trigger points refer pain to the lower back and posterior lateral chest in a pattern that may mimic renal or musculoskeletal low back pain. Its aponeurotic origin at the thoracolumbar junction is a site of strain injury. The muscle is identified during paraspinal approaches to the lower thoracic spine where it must be elevated to access the posterior ribs.
Traction injury at the thoracolumbar aponeurotic origin producing posterior lower chest and upper lumbar pain, often misdiagnosed as lumbar disc or renal pathology, responsive to dry needling and thoracic extension exercises.
This website uses cookies to enhance your experience. Some are essential for site functionality, while others help us analyze and improve your usage experience. Please review your options and make your choice.
If you are under 16 years old, please ensure that you have received consent from your parent or guardian for any non-essential cookies.
Your privacy is important to us. You can adjust your cookie settings at any time. For more information about how we use data, please read our privacy policy. You may change your preferences at any time by clicking on the settings button below.
Note that if you choose to disable some types of cookies, it may impact your experience of the site and the services we are able to offer.
Some required resources have been blocked, which can affect third-party services and may cause the site to not function properly.
This website uses cookies to enhance your browsing experience and ensure the site functions properly. By continuing to use this site, you acknowledge and accept our use of cookies.
