Bone Structure and Function: Osteons, Lamellae, and Marrow

Osteon

the basic "building block" of compact bone.

Concentric Lamellae

rings that make bone strong. resist torsion (twisting)

Interstitial Lamellae

"filler" between osteons. provide extra strength and stability.

Circumferential Lamellae

circles around the whole bone, help resist twisting.

Central Canal

tunnel in the middle with blood vessels and nerves.

Volkmann's Canal

side tunnels that connect blood and nerves between osteons.

Lacunae

little "houses" that hold bone cells.

Osteocytes

the bone cells that keep bone healthy.

Canaliculi

tiny canals so bone cells can "talk" and share nutrients.

Sharpey's Fibers

anchor the outer covering (periosteum) to the bone.

Periosteum

outer covering of bone; helps growth and repair.

Endosteum

inner lining; helps bone grow and heal.

Artery in Central Canal

brings blood to each osteon.

Artery in Perforating Canal

connects blood supply between osteons and the outside.

Trabeculae

"struts" or beams that make bone strong but light.

Bone Marrow

makes blood cells (red marrow) or stores fat (yellow marrow).