Sciatic nerve injury

The sciatic nerve is composed of lumbar 4, 5 and iliac 1 ~ 3 nerve roots, which is the thickest nerve in the whole body, and its starting diameter is about 15mm. The sciatic nerve usually penetrates from the inferior piriformis to the buttocks through the large sciatic foramen. In a few cases (36.21%), the sciatic nerve is divided into two strands, one piercing muscle and one piriformis. Divided into multiple pelvic pelvis. After entering the hip, it is located on the surface of the obturator internal muscle, superior and inferior diaphragm, and femoral muscle, covering the gluteus maximus, here is the shallowest part of the hip sciatic nerve. There is no thick branches in this section, and the surrounding tissue is loose. , Intramuscular injection, hip dislocation, pelvic fracture, etc. are all likely to cause sciatic nerve injury at this place. In its loose connective tissue sheath, the tibial nerve is located on the medial and posterior sides, and the common peroneal nerve is located on the anterolateral side. The tibial nerve is larger than the common peroneal nerve. The sciatic nerve travels downward in an arc, and descends at about the 1/3 intersection of the sciatic tubercle and the greater trochanter. This point is often used clinically to check the tenderness of the sciatic nerve. The sciatic nerve descends vertically and divides into two branches of the tibia and fibula to the lower third of the femur. The branch points of the sciatic nerve vary widely, some are divided into two branches by the phrenic nerve plexus, and some are divided into two branches in the lower thigh.