Most of the blood supply to the bone comes from two kinds of vessels that enter the core of the bone and then send their blood out to the perforating and central canal vessels. A break in the neck of the femur can cause avascular necrosis of the head of the femur. See figure 21-35 Text. Gigantism -excess growth hormone during childhood years. A fibrocartilage callus forms connecting the broken ends.
Osteoblasts invade the callus and convert it to bone.
It is then called a bony callus. Bone remodelling The osteoclasts and osteoblasts are active throughout your life. Parathyroid hormone . 21-24 b, text. This suggests that tonic control by PTH is sufficient.