There are many muscles next to the spine, the most important of which is the erector spinae. The longest and largest muscle is the erector spinae, which is located in the back of the trunk, in the grooves on both sides of the spine, from the back of the sacrum and the back of the iliacus muscle, and divides into three muscle bundles upward, along the way to the vertebrae and ribs, and upward to the mastoid part of the temporal bone, so it is one of the most important muscles next to the spine. There are other muscles next to the spine such as the pinch muscle, which starts from the lower part of the collar ligament, the spinous process of the 7th cervical vertebra and the upper part of the thoracic vertebra, and other muscles such as the rhomboid muscle and the scapular lift muscle.