Histology of compact bone showing<unk>  Each<unk>  consists of concentric layers, or lamellae, of compact bone tissue that surround a central canal, the haversian canal. The haversian canal contains the bone's blood supplies. The boundary of an<unk>  is the cement line. Each haversian canal is surrounded by varying number (5-20) of concentrically arranged lamellae of bone matrix. Near the surface of the compact bone, the lamellae are arranged parallel to the surface; these are called circumferential lamellae. Some of the<unk> lasts develop into<unk> ytes, each living within its own small space, or lacuna.<unk> ytes make contact with the cytoplasmic processes of their counterparts via a network of small transverse canals, or canaliculi. This network facilitates the exchange of nutrients and metabolic waste. Collagen fibers in a particular lamella run parallel to each other, but the orientation of collagen fibers within other lamellae is oblique. The collagen fiber density is lowest at the seams between lamellae, accounting for the distinctive microscopic appearance of a transverse section of<unk> s. The space between<unk> s is occupied by interstitial lamellae, which are the remnants of<unk> s that were partially resorbed during the process of bone remodeling.<unk> s are connected to each other and the periosteum by oblique channels called Volkmann's canals or perforating canals. Drifting<unk> s Drifting<unk> s are a phenomenon that is not fully understood. A "drifting<unk> " is classified as one that runs both longitudinally as well as transversely through the cortex. An<unk>  can "drift" in one direction or change directions several times, leaving a tail of lamella behind the advancing haversian canal.
Osteon
Osteoid
Sesamoid bone
Osteotome
Epiphyseal plate
Fibrous cap
Sawbones 
Metacarpal bones