What role does the annulus fibrosus play in the spinal column?

The annulus fibrosus is a crucial structure of intervertebral discs, situated between the vertebrae of the spinal column. Its primary function is to resist torsional forces, which are twisting forces applied to the spine. The annulus fibrosus is made up of several layers of fibrocartilage that are arranged in a concentric pattern. This distinctive structure provides strength and stability, allowing it to withstand rotational and shear forces that occur during movement.

When the spine undergoes torsional loading, the annulus fibrosus helps to distribute these stresses evenly throughout the disc and spine, reducing the risk of injury. This capacity to resist twisting forces is vital for maintaining the integrity and function of the spinal architecture during dynamic activities. Thus, the role of the annulus fibrosus in resisting torsional forces is fundamental to the overall biomechanics of the spinal column.