Multifidus Lumborum
Back
No image yet
The multifidus lumborum produces relatively small visible movements, but it plays a major role in controlling individual lumbar vertebrae. Its deep position and short, overlapping fibers make it especially important for segment-by-segment spinal stability.
Function
Bilaterally extends and stabilizes the lumbar spine. Unilaterally assists with contralateral rotation and ipsilateral lateral flexion. Its primary role is segmental stabilization of the lumbar vertebrae and control of small spinal movements during posture, lifting, walking, and trunk motion.
Origin
Posterior surface of the sacrum, posterior superior iliac spine, posterior sacroiliac ligaments, erector spinae aponeurosis, and mammillary processes of the lumbar vertebrae.
Insertion
Spinous processes of vertebrae approximately 2–4 levels superior to the point of origin.
Innervation
Medial branches of the posterior (dorsal) rami of the lumbar spinal nerves.