Where are blood cells formed in the skeletal system?

Hematopoiesis (from the Greek hemato, meaning “blood” and poiein, meaning “to make”), or red blood formation, occurs in the red bone marrow in adults. Adult red marrow, found in the proximal epiphysis (the ends) of the femur and humerus, some short bones, and in the vertebrae, sternum, ribs, hip bones, and cranium, is the site of production of all red blood cells (erythrocytes), platelets, and certain white blood cells.