1. STRUCTURE OF A LONG BONE

2. GROSS ANATOMY DIAPHYSIS – shaft DIAPHYSIS – shaft Makes up most of bone’s length Makes up most of bone’s length Composed of compact bone Composed of compact bone

4. Periosteum Fibrous connective tissue membrane Fibrous connective tissue membrane Covers and protects diaphysis Covers and protects diaphysis Connected by Sharpey’s Fibers Connected by Sharpey’s Fibers

6. EPIPHYSES Ends of long bone Ends of long bone Composed of thin layer of compact bone enclosing area of spongy bone Composed of thin layer of compact bone enclosing area of spongy bone

8. ARTICULAR CARTILAGE Covers epiphyses Covers epiphyses Glassy, hyaline Glassy, hyaline Provides smooth, slippery surface to decrease friction at joints Provides smooth, slippery surface to decrease friction at joints

10. Epiphyseal Line Adult bones: thin line of bony tissue spanning the epiphysis Adult bones: thin line of bony tissue spanning the epiphysis Remnant of epiphyseal plate (plate of hyaline cartilage in young, growing bone) Remnant of epiphyseal plate (plate of hyaline cartilage in young, growing bone) Cause lengthwise growth until end of puberty Cause lengthwise growth until end of puberty

12. MEDULLARY CAVITY Yellow marrow – cavity of shaft Yellow marrow – cavity of shaft In adults: storage for adipose tissue In adults: storage for adipose tissue In infants: area forms blood cells, red marrow In infants: area forms blood cells, red marrow (In adults: red marrow is confined to cavities of spongy bone of flat bones, and epiphyses of some long bones: sternum, ribs, femur, cranium) (In adults: red marrow is confined to cavities of spongy bone of flat bones, and epiphyses of some long bones: sternum, ribs, femur, cranium)