An intervertebral disk acts as shock absorber between each of the vertebrae in the spinal column by keeping the vertebrae separated when there is impact from activity. They also serve to protect the nerves that run down the middle of the spine and intervertebral disks.

Why are intervertebral discs so strong?

The stiff laminae can withstand compressive forces. The fibrous intervertebral disc contains the nucleus pulposus and this helps to distribute pressure evenly across the disc. This prevents the development of stress concentrations which could cause damage to the underlying vertebrae or to their endplates.

What is the principal function of an intervertebral disc?

The inter- vertebral disc serves primarily to allow movement between adjacent vertebral bodies, to absorb shock, and to transmit loads through the vertebral column. The complex morphology and structure of the intervertebral disc of the lumbar spine reflects these functions.