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The vertebrae are numbered and divided into regions: cervical, thoracic, lumbar, sacrum, and coccyx (Fig. 2). Only the top 24 bones are moveable; the vertebrae of the sacrum and coccyx are fused. The vertebrae in each region have unique features that help them perform their main functions.
The deep back muscles, also called intrinsic or true back muscles, consist of four layers of muscles: superficial, intermediate, deep and deepest layers. These muscles lie on each side of the vertebral column, deep to the thoracolumbar fascia.
The spine itself has three main segments: the cervical spine, the thoracic spine, and the lumbar spine. The cervical is the upper part of the spine, made up of seven vertebrae (bones). The thoracic is the center portion of the spine, consisting of 12 vertebrae.
The sacrospinalis (also called the erector spinae) is actually three muscles. They are the spinalis, iliocostalis, and longissimus. Each of these muscles is divided into three parts that correspond to the part of the back where they're located.
Anatomists name the skeletal muscles ing to a number of criteria, each of which describes the muscle in some way. These include naming the muscle after its shape, size, fiber direction, location, number of origins or its action. Muscle Shape: The names of some muscles reflect their shape.