31. The acetabulum is only partly open, and there are only two sacral vertebrae, the lowest number among dinosaurs. 32. The hip joint includes the articulation of the femoral head ( of femur ) and the acetabulum of the pelvis. 33. The "'acetabular notch "'is a deep notch in the acetabulum of the hip bone. 34. The femur connects at the acetabulum of the pelvis and projects laterally before angling medially and inferiorly to form the knee. 35. Like the obturator internus muscle, the gemellus superior and gemellus inferior help to steady the femoral head in the acetabulum . 36. The ilium is robust and long, and has a large acetabulum similar to that in " Remingtonocetus ". 37. During locomotion directional movement of the body is done by successive attachment and detachment of the oral sucker and the acetabulum . 38. Fractures of the acetabulum in young individuals usually result from a high energy injury like vehicular accident or feet first fall. 39. When the sucker attaches itself on an object, the infundibulum maily provides adhesion while the central acetabulum is quite free. 40. "' Fractures of the acetabulum "'occur when the head of the femur is driven into the pelvis.
