where is the acetabulum located in the body
Acetabulum The acetabulum /æsəˈtæbjʊləm/ (cotyloid cavity) is a concave surface of a pelvis. The head of the femur meets with the pelvis at the acetabulum, forming the hip joint.[1][2]
Ulna Close to the elbow, the ulna has a bony process, the olecranon process, a hook-like structure that fits into the olecranon fossa of the humerus. This prevents hyperextension and forms a hinge joint with the trochlea of the humerus. There is also a radial notch for the head of the radius, and the ulnar tuberosity to which muscles attach.