Final answer:
The ilium, ischium, and pubis are the three fused bones that make up the pelvic bones.
Step-by-step explanation:
The three fused bones that make up the pelvic bones are the ilium, ischium, and pubis. The ilium forms the large, fan-like region of the hip bone, while the ischium forms the posteroinferior region, providing support when sitting. The pubis curves medially and joins to the pubis of the opposite hip bone at the pubic symphysis.