The term of the pelvic bones refers to the two large bones that make up the pelvis, the ilium and the ischium. The ilium is the uppermost and largest of the two bones, and it is often referred to as the 'iliac bone'. It is a flat bone located at the top of the hip joint and is connected to the sacrum and the spine. The ischium is the lowermost and smallest of the two bones, and it is located at the bottom of the hip joint. It is connected to the femur and helps to support the body's weight when sitting.