Compact Bone. Compact bone consists of closely packed osteons or haversian systems. The osteon consists of a central canal called the osteonic (haversian) canal, which is surrounded by concentric rings (lamellae) of matrix.Between the rings of matrix, the bone cells (osteocytes) are located in spaces called lacunae.ompact Bone. Compact bone consists of closely packed osteons or haversian systems. The osteon consists of a central canal called the osteonic (haversian) canal, which is surrounded by concentric rings (lamellae) of matrix.
It's only the difference in pronunciation. In English, lootenant is chiefly the American pronunication and leftenant the British. In the British and U.S. armies, 1st and 2nd lieutenants are junior officers, and the ranking system is roughly equivalent between the two armies.
Something that is an accessory to something but not an integral part of it is an appurtenance. If you buy a car, you may want to purchase a few appurtenances for it, like an ice scraper and fuzzy dice to hang from your rear view mirror. The noun appurtenance does not only refer to tangible objects, such as appurtenances of a certain lifestyle. It can also mean equipment or gear for a certain task. By the time you fill your locker with all the appurtenances of a high school student, you won't have room for a coat.