To which regions does the Rotatores muscle extend?

The Rotatores muscle is part of the intrinsic muscles of the back, specifically categorized as deep segmental muscles. These muscles are responsible for the stabilization of the vertebral column and assist in movements such as rotation and extension of the spine.

The correct answer indicates that the Rotatores extend through the cervical, thoracic, and lumbar regions. This is accurate because the Rotatores muscle group is found throughout the entire vertebral column, though they are most prominent in the thoracic region. They are composed of two layers: the Rotatores brevis, which connects adjacent vertebrae, and the Rotatores longus, which connects vertebrae that are two levels apart. This arrangement allows them to function effectively in all three regions—cervical, thoracic, and lumbar—facilitating stability and intricate movements of the spine.

Considering other options, the choice that confines the Rotatores to only cervical and lumbar regions fails to acknowledge their significant presence and function in the thoracic region. Alternatively, options that restrict them solely to the thoracic region or the thoracic and sacral regions neglect the cervical involvement of these muscles, thereby not fully representing their anatomical distribution.