The deep muscles of the back flex the vertebral column.

Vertebral Column

The vertebral column, also known as the spine or backbone, is a series of interconnected bones called vertebrae that enclose and protect the spinal cord while allowing a person to stand upright and move flexibly.

Deep Muscles

Muscles located beneath the superficial layers that are responsible for stabilizing joints and performing specific movements.

Back Flex

The act of bending the spine backward or the movement involving the retraction of the spine.