The human spine consists of 32–33 vertebrae and is divided into five main sections. The cervical section supports the head and allows it to move in various directions. The first cervical vertebra plays a special role, connecting the spine to the skull. The thoracic section, together with the ribs, forms the rib cage, which protects vital organs such as the heart and lungs. The lumbar section is the largest and strongest, as it bears the primary load during physical activity. It is responsible for bending and straightening the torso and for movements in various planes. The lumbar vertebrae are often prone to changes, including the formation of intervertebral hernias. The sacral and coccygeal sections participate in pelvic movements.
Intervertebral discs are elastic structures located between the vertebrae. They consist of two main components: the fibrous ring and the nucleus pulposus. Their functions include:
- Shock absorption.
- Providing flexibility.
- Maintaining optimal distance between vertebrae.