Lamellae found lying between osteons that are not part of an osteon are called ______ lamellae.

Choice A reason: Central lamellae is not a recognized anatomical term. The central canal, however, is part of an osteon and contains blood vessels and nerves. It does not refer to lamellae between osteons.

Choice B reason: Concentric lamellae are rings of bone matrix that surround the central canal within an osteon. They are integral to the osteon structure and not found between osteons.

Choice C reason: Circumferential lamellae are located around the outer and inner surfaces of compact bone, encircling the entire bone structure. They are not found between osteons.

Choice D reason: Perforating canals, or Volkmann’s canals, run perpendicular to the central canals and connect them to the periosteum and medullary cavity. They are not lamellae and do not lie between osteons.

Choice E reason: Interstitial lamellae are remnants of old osteons that have been partially resorbed during bone remodeling. They fill the spaces between current osteons and are not part of any single osteon, making them the correct answer.

Choice A reason: Flat bones are typically thin and broad, such as the sternum or skull bones. They do not match the described dimensions of Emily’s bone.

Choice B reason: Irregular bones have complex shapes that do not fit into other categories, such as vertebrae. The bone described is not irregular.

Choice C reason: Short bones are roughly cube-shaped and found in areas like the wrist and ankle. A bone that is 3 inches long does not fit this category.

Choice D reason: Long bones are characterized by being longer than they are wide, typically found in the limbs. A bone that is 3 inches long and 1 inch wide fits this classification.

Choice E reason: Sesamoid bones are small, round bones embedded in tendons, like the patella. The described bone does not fit this category