ANATOMY

Detailed explanation-1: -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.

Detailed explanation-2: -Osteons are the functional units of compact bone. The term functional unit means the smallest unit that can carry out one of the organ’s functions. Compact bone is made of cylindrically-shaped osteons connected together.

Detailed explanation-3: -Spongy bone tissue does not contain osteons that constitute compact bone tissue. Instead, it consists of trabeculae, which are lamellae that are arranged as rods or plates.

Detailed explanation-4: -Osteon. The basic functional unit of a mature compact bone.