The sciatic nerve is the largest nerve, and with its neuralgia, pain symptoms and muscle symptoms are possible.
The sciatic nerve consists of sensitive and motor fibers departing from the lumbar and sacral segments of the spinal cord. From the cavity of the pelvis, the sciatic nerve extends through the slit under the pear-shaped muscle, then from below the lower edge of the large sphincter muscle to the back of the thigh and crosses the area of the glansal fold, being close enough to the skin.
In the upper part of the popliteal fossa, the sciatic nerve is divided into two large, finite branches - the tibia and the common tibia nerve, the ending of which innervates the skin and leg muscles and foot.
Sensitive fibers of the sciatic nerve collect information from sensitive leg receptors, from articular receptors and muscle receptors that respond to the extent of their stretching.
The pulses that follow the motor fibers of the sciatic nerve and its terminal branches cause a reduction in the quadriceps of the hip, tibia and other muscles of the lower limb.
Manifestations of neuralgia of the sciatic nerve
The first signs of neuralgia of the sciatic nerve are often burning pain and paresthesia in the area of the leg and foot (feeling numbness, crawling ants, tingling, burning). Possible reduction of superficial sensitivity of the skin. This is due to the affection of sensitive nerve fibers.
Much less common is the weakness of the muscles of the leg and foot in connection with damage to the motor fibers.
Characteristic for neuralgia of the sciatic nerve is a symptom of Lasega. For his discovery of a patient lying on his back, lift a leg that is bent in the knee joint. When a pain occurs along the sciatic nerve, the symptom is considered positive. The bending of the leg in the knee joint leads to the fact that the pain weakens or passes, and further bending of the leg in the hip joint passes painlessly.
When you press in the region of the gluteal fold, in the place of the nerve output on the back of the thigh, there is pain, often spreading along the nerve to the popliteal fossa.
Neuralgia of the sciatica: causes
The most common cause of neuralgia of the sciatic nerve is lumbar osteochondrosis, which is accompanied by pustular muscle spasms (pear-like muscle syndrome). In this case, the spastic contraction of the muscle closes the nerve to the side lies a sacrum-spinous ligament, causing a violation of its function.
Treatment of the sciatic nerve neuralgia consists of pain relief therapy in the exacerbation phase and in the treatment of spinal osteochondrosis.