31. This is can also be done in combination with internal obturator muscle transposition, especially when that muscle is weak. 32. Like the obturator internus muscle, the gemellus superior and gemellus inferior help to steady the femoral head in the acetabulum. 33. "' Obturator rings "'are a specific type of piston ring used in World War I cylinders. 34. This obturator was self-sustaining and it restored the function of Soft palate and allowed the wearer to speak correctly. 35. Also, the bolt's rubber obturator eroded in action, although it was easily replaced in the field by infantrymen. 36. The "'superior ramus "'is a partial origin for the internal obturator and the external obturator muscles. 37. The "'superior ramus "'is a partial origin for the internal obturator and the external obturator muscles. 38. It distributes branches to the obturator externus, pectineus, anastomoses with the posterior branch and with the medial femoral circumflex artery. 39. The ischium is bird-like : small with a low obturator process and processes on the upper and lower rear edge. 40. A palatal obturator may be used in cases of a deficiency in tissue, when a remaining opening in the palate occurs.