A thin strip of tissue, the multifidus muscle starts at the sacrum bone at the base of the spin and extends up the axis, which is commonly referred to as the second cervical vertebra. The muscle features multiple insertion points along the spine, specifically into the spinous process of each vertebra. The muscle features a lot of tendon-like fasciculi that arise from many central regions of the back. These include the sacral, lumbar, thoracic, and cervical regions. As a result, the fasciculi do not have standard universal lengths. Variation may depend on not only region, but they exact vertebra serviced. In the process, the muscle provides stiffness, stability, and support to the spinal column. Since the column is part of the central nervous system, support is all the more necessary. The multifidus muscle allows each vertebra to work more efficiently, and as a result, the muscle guards against spinal joint degradation. The posterior branches of the spine innervate the muscle at various locations.
Written and medically reviewed by the Healthline Editorial Team
In Depth: Multifidus