Where is the sciatic nerve?

For the sciatic nerve where the problem, sciatic nerve is by the lumbar four, lumbar five, sacral one, sacral two, sacral three, five nerve roots before the composition, after entering the pelvis, in front of the sacroiliac joint through the sciatic foramen, through the piriformis muscle to reach the buttocks, down to the popliteal fossa above, will be divided into tibial nerve and common peroneal nerve, this is the sciatic nerve site. Normal sciatic nerve common disease, such as sciatica, is caused by infection; For example, lumbar disc herniation, lumbar spondylolisthesis, lumbar spinal stenosis will cause pressure on the spinal nerve root, so the patient's sciatic nerve pain symptoms, will be manifested as hip, thigh rear, leg radiation pain. Normal needs to be combined with physical examination, and with some auxiliary examinations, such as lumbar CT and MRI can be clearly diagnosed.