Multifidus Muscle, Posterior View

Description

Running longitudinally along the posterior vertebral column, the multifidus is presented as paired, segmental slips that fill the groove between the spinous processes medially and the transverse processes and laminae laterally. Inferiorly, its thickest bundles arise from the dorsal sacrum and posterior superior iliac spine region, blending with the posterior sacroiliac ligaments and sacral fascia before ascending across the lumbar spine. More superiorly, the fibers span multiple vertebral levels to insert onto the spinous processes of the lumbar, thoracic, and cervical vertebrae, lying deep to the erector spinae and adjacent to the costotransverse region of the thoracic cage. Bony landmarks remain clear. Ribs arc laterally from the thoracic spine, and the iliac crests frame the lower field. Segmental organization is the point. This posterior view aligns well with teaching how the transversospinalis group controls intersegmental motion and resists shear, an anatomical basis for clinical discussions of lumbar instability and persistent low back pain. Multifidus atrophy and fatty infiltration are common findings after acute episodes of back pain and following lumbar surgery, and they correlate with impaired spinal motor control. The relationships here also map directly to the surgical corridor of posterior lumbar approaches, where retraction and denervation risks involve deep paraspinal planes and the medial branches of the dorsal rami. Spine anatomy courses, orthopedic and neurosurgical teaching files, and rehabilitation texts on lumbar stabilization will all benefit from this arrangement, since it helps readers connect vertebral level, fascial plane, and muscle function without switching between atlas plates. It also fits patient education materials explaining why targeted multifidus activation is emphasized in some physical therapy protocols. Anatomical accuracy verified by SciePro's Medical Advisory Board.