Which part of the hip bones is referred to as the ischium?

The ischium is indeed referred to as the back lower portions of the hip bones. It is one of the three main components of the pelvic bone, alongside the ilium and pubis. The ischium forms the lower and back part of the pelvis, contributing to the structure that supports the weight of the body when sitting and provides attachment points for various muscles and ligaments. Understanding the anatomy of the pelvis, including the location and function of the ischium, is crucial for professionals working in fields related to brain injury and rehabilitation, as it plays a role in mobility and overall physical function.