In adults, hemopoiesis is largely restricted to which set of bones?

1. In children, hemopoiesis can still run in the medullary cavity of the long bones. 2. With age that activity retreats towards the axial skeleton and the bone ends. 3. In adults it is largely restricted to the cranial and pelvic bones, the vertebrae, the sternum and the proximal epiphyses of the femur and humerus. 4. The shafts of the long bones are exactly what adults lose, so that option describes the childhood pattern. 5. The proximal epiphyses are retained, not the distal ones, so the radius and ulna option inverts the rule. 6. Ribs and clavicles are not in the list given, so the option naming them cannot be selected on the evidence available. _Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 18 "The Cardiovascular System: Blood", section 18.2 Production of the Formed Elements_