Lülidevahelised

Lülidevahelised, also known as intervertebral discs, are fibrocartilaginous structures located between the vertebrae of the spine. They serve several essential functions, including absorbing shock, allowing flexibility, and maintaining the proper spacing and alignment of the vertebral column.

Each intervertebral disc consists of two main parts: the nucleus pulposus and the anulus fibrosus. The nucleus pulposus is the gel-like core that provides cushioning and flexibility. Surrounding it, the anulus fibrosus is a tough, fibrous ring composed of several layers of collagen fibers, which contain the nucleus and resist twisting and stretching forces.

Lülidevahelised are vital for the mobility of the spine, enabling movements such as bending, flexing, and twisting. They also help distribute mechanical loads evenly across the vertebral column, reducing stress on individual vertebrae.

Degeneration or injury to the intervertebral discs can lead to conditions such as herniated discs, disc bulges, or degenerative disc disease. These ailments may cause pain, numbness, or weakness in associated regions due to nerve compression.

The health of intervertebral discs depends on factors like age, genetics, physical activity, and overall health. Disc nutrition is facilitated primarily through diffusion from surrounding tissues, as the discs have limited blood supply.

In summary, lülidevahelised are crucial components of the vertebral column that contribute to spinal flexibility, shock absorption, and load distribution. Their integrity is essential for maintaining spinal health and function.