* Central Canal,
* Artery,
* Vein,
* Nerve,
* Lymph vessel,
* Endosteum,
* Concentric lamellae - rings of rigid ECM, store and create tricalcium phosphate and calcium carbonate,
* Collagen fibers - provide tensile strength to the bone,
* Osteocytes - make the ECM,
* Lacunae - protect osteocytes from ECM,
* Canaliculi - share oxygen and nutrients with cells; allow cells to communicate (in bones)