Anatom3DMultifidus lumborum muscle
Musculus multifidus lumborum · Mnohoklanný sval beder
Muscles
Looks like
The thickest part of multifidus, deep bundles in the lower back from the sacrum and lumbar vertebrae to spines 2–4 levels above.
What it does
Holds each lumbar level steady and extends the lower back.
Keeping it well
Shrinks and weakens in chronic low back pain; guided exercise to reactivate it helps.