HAVERSIAN SYSTEMS OR OSTEONS OF LAMELLAR BONES – 1
The arrangement of concentric curved lamellae constituting tunnels is found in the lamellar bone of most diaphyses. This arrangement is called Haversian system or osteon.
Haversian systemsHaversian canal or osteonal canal. It is occupied by blood vessels and nerves. The presence of lymphatic vessels within the canals is still subject to discussion.
The surface of the Haversian canal is lined with osteoblasts, as any other inner bone surface.
Haversian systemsHaversian canal or osteonal canal. It is occupied by blood vessels and nerves. The presence of lymphatic vessels within the canals is still subject to discussion.
The surface of the Haversian canal is lined with osteoblasts, as any other inner bone surface.
Top image
Schematic drawing of a Haversian system formed by three round lamellae.
Bottom image
The lamellae of the Haversian system are formed by collagen fibers arranged in parallel. Observe how the directions of the fibers differ from one lamella to the other. This arrangement offers great resistance towards mechanical pressure and torsion.
