Haversian System

Haversian system or osteon, refers to the basic functional unit of the solid compact bone. These are generally like cylindrical structures with several millimeters length-wise and about 0.2 mm in diameter, and are mainly present in the bones of different mammals, birds, amphibians, reptiles. The system is said to comprise concentric layers (also called lamellae) of compact bone tissue, surrounding a central canal, known as the Haversian canal. The canal consists of the nerves and blood supplies of the bone. Haversian system’s boundary is referred to as the cement line. Osteons are separated from each other through interstitial lamellae in between systems, and are linked with each other and the periosteum through Volkmann’s canals.