Origin
- Th11-L2 through the Thoracolumbala fascia
Attachment
- Costae 9-12
Innervation
- Th9-Th12 Rr. Ventralis & Nn. Intercostalis
Plexa
Function
Unilateral function
- Depression of costae 9-12
- Contralateral rotation of thoracic and lumbar spine (Th11-L2)
- Ipsilateral rotation of torso
Bilateral function
- Accessory muscle on exhalation
- Extension of trunk
Artery
Antagonist
- M. Pectoralis major
- M. Serratus anterior
Joints involved
- Costovertebraljoints Th9-Th12
- Intervertebraljoints Th11-L2
Descriptive text
The muscle is located below the M. Latissimus dorsi. It is thin and flat. It runs from the thoracolumbar junction obliquely upwards. The fiber direction goes obliquely upwards laterally to the lower ribs.
Exercise
Training tips
Therapist tips
- Sometimes causes pain when forced to breathe
- Raising and lowering the ribs can cause pain.
Treatment recommendations
- Massage
- Acupressure
- Dry needling
- Ledmanipulation
- Stretch (home stretch and by therapist)
- TENS
- NMES
- Cervical traction
- Heating / Cooling