Epiphysis
- Wider section at each end of the bone
- Filled with cancellous (spongy bone) and covered by a hard thin casing of cortical bone
- Red bone marrow fills the spaces between the cancellous bone
Metaphyis
- The neck portion of a long bone between the epiphysis and the diaphysis
- Contains the epiphyseal growth plate, the site of bone formation and long bone elongation
Diaphysis
- Shaft of the bone composed of a thick, hard cortex with a hollow interior medullary cavity
- Medullary cavity is filled with yellow bone marrow
