D. Functional Anatomy of Long Bones- Microscopic anatomy of compact bone

central canal

also known as the Haversian canal, runs parallel to the axis of bone and are located in the middle of each osteon. Each one possesses an artery and vein, lymph vessel, and nerve.

Interstitial lamellae

fill in the spaces between adjacent osteons of compact bone. These lamellae are remnants of osteons whose matrix components have been almost completely recycled by the action of bone digesting cells.

lacunae

mature bones cells, called osteocytes, are trapped within an open space called a lacuna. Osteocytes cannot divide and therefore each lacuna contains only one osteocyte.

lamellae

nested, concentric rings of matrix surrounding the central canal.

perforating canals

passageways that extend perpendicular to the axis of the bone and connect the central canals of adjacent osteons.

canaliculi

processes of the osteocytes extend into narrow crevices, called canaliculi, that penetrate the lamellae and connect the lacunae to the central canal.

Circumferential lamellae

specialized lamellae found at the outer and inner surfaces of bone, where they are covered by the periosteum and endosteum, respectively. These lamellae are produced during the growth and maintenance of bone.

osteon

the basic structural and functional unit of bone consisting of bone cells organized around a central canal and separated by concentric lamellae.