The term 'Parts of Pelvises' refers to two anatomical structures located in the pelvic region. The sacrum, which is a triangular bone at the base of the spine, is composed of five fused vertebrae and is often referred to as the 'sacral bone'. The ilium is a large, curved bone that forms the upper part of the pelvis and is located on either side of the sacrum. Together, these two bones form the bony structure of the pelvis.