1. A thin membrane of connective tissue that lines the inner surface of the medullary cavity of bones.
Usage: anatomy; medical

Examples

• The endosteum plays an important role in bone remodeling and repair.
• Osteoblasts in the endosteum help produce new bone tissue.
• The endosteum lines the inner walls of the medullary cavity.
• During bone fracture healing, the endosteum becomes more active.
• The endosteum is thinner and less organized than the periosteum.