Final answer:
The ilium, ischium, and pubis fuse to form each os coxae of the hip bone, which is true. The ilium constitutes the superior part of the hip bone, articulating with the sacrum.
Step-by-step explanation:
The fusion of the ilium, ischium, and pubis form each os coxae, which is a true statement. These three regions of the hip bone come together to create the pelvic girdle portion of the pelvis. During the late teenage years, these parts fuse to become the adult hip bone. The ilium is particularly important as it makes up the largest portion of the hip bone, forming a fan-like, superior region and is firmly united to the sacrum at the sacroiliac joint. The ischium forms the posteroinferior region and the pubis makes up the anterior portion, joining with the opposite pubis at the pubic symphysis.
Parts of the Hip Bone
The ilium forms the superior, fan-like region of the hip bone and is united to the sacrum.
The ischium forms the lower, posterior part of the hip bone, supporting the body when sitting.
The pubis forms the anterior portion of the hip bone and joins with the opposite pubis at the pubic symphysis.