The presence of pressure pain in the area of the foramen magnum and foramen minora is one of the clinical manifestations of a sciatic hernia. The prolapse of abdominal organs or tissues through the foramen magnum and foramen minora is called a sciatic hernia (sciatichernia). What can cause sciatic hernia? The pelvis is a strong bone ring formed by the posterior sacrum, coccyx and both hip bones linked by bone. The sacral nodal ligament and sacrospinous ligament of the pelvis are enclosed with the large sciatic notch to form the greatersciatic foramen, and with the small sciatic notch to form the small sciatic notch (1essersciatic foramen). The superior border of the greater foramen of the sciatic bone and the front is the hip bone, the back is the sacral tubercle ligament, and the inferior border is the sacral spinal ligament. Through this foramen, there is the pear-shaped muscle, above which the superior gluteal nerve and blood vessels pass, and below which the sciatic nerve, inferior gluteal nerve, pubic nerve and blood vessels penetrate. Anterior to the small sciatic foramen is the sciatic tuberosity, bounded superiorly by the sciatic spine and sacrospinous ligament, and posteriorly by the sacrospinous ligament, through which the pubic nerve and blood vessels pass, as well as the tendons within the closed foramen. When the muscles around the large or small sciatic foramen are paralyzed or injured, the organs in the lower abdomen and pelvis can be herniated under the increased intra-abdominal pressure. Pathogenesis: According to the route of herniated contents, there are three types of sciatic hernias: supraspinatus type of the foramen magnum, infraspinatus type and inferior sciatic spine type through the foramen minor. 2. Pathology: The internal opening of the sciatic hernia is in the ovarian fossa posterior to the broad ligament. The contents of the hernia can be any organ in the lower abdomen and pelvis, but the small intestine is the most common. After entering the hernia sac, the hernia contents prolapse out of the pelvis via the superior or inferior pear muscle, or the inferior sciatic spine, and enter the femur downward along the sciatic nerve of least resistance, emerging at the inferior border of the gluteus maximus or the posterior aspect of the thigh.