The longissimus muscle is a long intrinsic muscle of the back. Along with spinalis and iliocostalis, these three muscles comprise the erector spinae group. The erector spinae is a large musculotendinous complex that runs along the entire length of the vertebral column and comprises the intermediate layer of the intrinsic, or deep, back muscles. Longissimus is the longest, thickest and most central erector spinae muscle. It is divided into three parts (capitis, cervicis, thoracis) based on their

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