Osteon: The fundamental unit of compact bone, consisting of concentric layers (lamellae) of calcified matrix surrounding a central canal containing blood vessels and nerves.
Spongy Bone:A lighter, less dense type of bone tissue found inside bones, characterized by a porous structure that houses bone marrow and supports hematopoiesis.
Bone Marrow:A soft tissue inside bones that produces blood cells and contributes to the immune system's functioning