Muscle
Multifidus
Deep segmental stabiliser
High-yield
Key deep segmental stabiliser of the spine (esp. lumbar); dorsal rami. Thickest in the lumbar region.
Overview
A deep transversospinalis muscle spanning 2–4 vertebrae that stabilises the spine segment-to-segment and produces small rotations.
Reference facts
- Origin
Sacrum, ilium, and transverse processes of vertebrae
- Insertion
Spinous processes 2–4 segments superiorly
- Action
Stabilises the vertebrae; extends and contralaterally rotates the spine
- Innervation
Dorsal rami of spinal nerves
- Blood supply
Segmental (posterior intercostal, lumbar) arteries