Musculi multifidi
Origin
Sacrum, Erector spinae Aponeurosis, PSIS, and Iliac crest
Insertion
spinous process
Function
Stabilization of the spine
Innervation
Posterior branches of spinal nerves
Musculi multifidi (Singular Musculus multifidus, from lat. split many times; 'feathered muscle') are described as short, tendinous skeletal muscles which run along the spine from the sacrum to the axis covering all three spinal segments. They are part of the group of transversospinales, a muscle group whose purpose is to stabilize the segmented vertebrae found in all mammals.