What is the primary function of intervertebral discs?

The primary function of intervertebral discs centers around their role in absorbing shock and providing flexibility to the spinal column. These discs are situated between the vertebrae in the spine and serve as cushions that enhance the spine's ability to withstand compressive forces during activities such as walking, lifting, or running. By absorbing shock, they prevent the vertebrae from grinding against each other, which can lead to pain and injury.

Furthermore, intervertebral discs contribute to the overall flexibility of the spine. They allow for movement and bending in various directions, including flexion (forward bending), extension (backward bending), and lateral movements. This flexibility is crucial for maintaining a healthy range of motion and for supporting dynamic activities performed by the body.

Other choices relate to functions not primarily associated with intervertebral discs. For example, the discs do not facilitate head rotation, provide direct pathways for spinal nerves, or support the skull structure. Instead, these functions are carried out by different anatomical structures within the cervical and cranial regions of the body. Thus, the answer highlights the essential role of intervertebral discs in maintaining spine integrity and function.