Multiple choice Red bone marrow in the human adult is found in spongy bones of the cranial region only ribs, sternum, proximal extremities of femur and humerus vertebral centra only all the above locations Reveal answer Fill a bubble to check yourself D Correct answer Explanation In adults, red bone marrow is found in the spongy bone of the ribs, sternum, vertebrae, pelvis, and the proximal ends of the femur and humerus.