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About sciatica

Sciatica is a syndrome that manifests itself in the form of pain spreading along the sciatic nerve. Its origin is associated with the compression of the roots of the spinal cord, located at the level of the lumbar spine.

Sciatica almost never occurs until 30 years. All patients are older people.

There are a lot of reasons that can lead to compression of the nerve roots and the appearance of lumbosacral radiculitis. In this regard, the manifestations of sciatica can vary greatly from person to person.

Structure of the lumbar spine
The lumbar spine is represented by five vertebrae, which are large in comparison with the others, the massive front part - the body, - and the spinal processes behind it (the protruding posterior part of the vertebra - see the illustration).
Between the bodies of the lumbar vertebrae are intervertebral discs.

Structure of the intervertebral disc:
The pulpous (gelatinous) nucleus is in the central part and plays the role of a shock absorber during walking;

A dense fibrous ring surrounds the gelatinous core around the periphery and does not allow it to fall outside the vertebral body.

Above, the lumbar spine is connected to the inferior thoracic region, from below - with the sacrum, which is a single bone. The lumbar vertebrae are interconnected with each other, and they have the greatest load. Therefore, in this area most often occur disorders, leading to compression of the nerve roots.

Structure of the spinal cord, nerve roots, sciatic nerve
The spinal cord passes in a narrow spinal canal, which is formed by the bodies and arcs of the vertebrae (see illustration). It leaves the paired nerve roots, which go out through the intervertebral openings formed by two adjacent vertebrae. Then the roots are joined together and form a sacral nerve plexus (so called because it is near the sacrum). It leaves several nerves, including sciatic.

The sciatic nerve is the largest in the human body. It contains many sensitive and motor fibers and passes over the posterior surface of the buttocks and thighs, and then splits onto the lower legs into smaller branches - tibial and peroneal nerves.

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