ARRANGEMENT OF LAMELLAR BONE IN DIAPHYSES – 1
Diaphyses are the hardest component of long bones. They are formed by the compact type of bone and provide strong resistance against mechanical forces.
The diagram illustrates a small part of a cross-sectioned diaphysis.
Notice the following items of the figure:
– Four Haversian systems are highlighted in different shades of blue.
– Stacks of flat or sligthly curved parallel bone lamellae fill the spaces between Haversian systems.
– Haversian canals placed at the center of each Haversian system contain blood vessels and nerves (nerves not shown in the figure).
– Tunnels called Volkmann’s canals placed at right angles in relation to the bone long axis conduct branches of blood vessels that convey blood crosswise between Haversian canals. nourish the cells of the Havers systems and nerves.
Not shown in drawing: that the Haversian systems are superposed one over the next forming parallel columns.
The diagram illustrates a small part of a cross-sectioned diaphysis.
Notice the following items of the figure:
– Four Haversian systems are highlighted in different shades of blue.
– Stacks of flat or sligthly curved parallel bone lamellae fill the spaces between Haversian systems.
– Haversian canals placed at the center of each Haversian system contain blood vessels and nerves (nerves not shown in the figure).
– Tunnels called Volkmann’s canals placed at right angles in relation to the bone long axis conduct branches of blood vessels that convey blood crosswise between Haversian canals. nourish the cells of the Havers systems and nerves.
Not shown in drawing: that the Haversian systems are superposed one over the next forming parallel columns.
Lamellar bone in a diaphysis, formed by Haversian systems and short parallel curved lamellae.
