lecture exam 3- bones

 Cube-shaped bones (in wrist and ankle) Sesamoid bones form within tendons (example: patella) Vary in size and number in different individuals

 Thin, flat, slightly curved

 Sternum, scapulae, ribs, most skull bones

 Complicated shapes

 Vertebrae and hip bones

structure: osteon

Osteocyte communication and nutrients waste

blood supply

Structure: Trabeculae

found within trabecular cavities of spongy bone and diploë of flat bones, such as sternum

– Mitotically active stem cells in periosteum and endosteum

– When stimulated, they differentiate into osteoblasts or bone-lining cells

– Some remain as osteogenic stem cells

Bone-forming cells that secrete unmineralized bone matrix called osteoid

Mature bone cells in lacunae that no longer divide

– Maintain bone matrix and act as stress or strain sensors

•Fusion of macrophages (white blood cells)•Multiple nuclei•Resorb bone