Torso skeleton with schematically outlined lateral autochthonous back muscles. Autothonous muscles are all muscles that are innervated by dorsal rami of spinal nerves. They are also called spinal erectors. On a living person, one can see two longitudinal bulges on the sides of the spinal processes that are most distinct in the pelvic area. The muscles are located in an osteofibrous canal consisting of vertebrae bows, costal processes, and spinal processes. The fibrous limitation consists of the posterior and lateral thoracolumbar fascia. The spinal erectors caan be subdivided into a lateral superficial and a medial profound tract. The lateral tract extneds from the pelvis up to the cranium.
