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Ultrasound image of the left lumbar multifidus (parasagittal) taken at the spinal level of L4/5 (a), the left lumbar multifidus (transverse) taken at the spinal level of L5 (b) and the left iliocostalis lumborum, taken at the spinal level of L3 (c). IL, iliocostalis lumborum; L3, 3rd lumbar vertebrae; L4/5, zygapophyseal joint between L4 and L5; LD, latissimus dorsi; LM, lumbar multifidus; QL, quadratus lumborum; SP, spinous process; TA, transverse abdominus; TLF, thoracolumbar fascia
