structures of a bone

• periosteum: tough, fibrous tissue that forms the outermost covering of bone.
• compact bone: dense, hard, and very strong bone that forms the protective outer layer of bones.
• spongy bone: is lighter but not as strong compact bone that is commonly found in the ends and inner portions of long bones; contains red bone marrow.
• the medullary cavity: located in the shaft of a long bone and is surrounded by compact bone.
• endosteum: tissue that lines the medullary cavity.
• diaphysis: shaft of a long bone.
• epiphysis: covered with articular cartilage, is the wide end of a long bone.