Final answer:
The small spaces between concentric lamellae that contain osteocytes are called lacunae. They house osteocytes and are interconnected by tiny channels known as canaliculi, facilitating nutrient and waste transport.
Step-by-step explanation:
The small spaces between concentric lamellae that contain osteocytes are known as lacunae. These lacunae serve as chambers for the osteocytes, which are mature bone cells. They are situated at the borders of adjacent lamellae and are interconnected by tiny canals called canaliculi. The canaliculi enable the transportation of nutrients to the osteocytes and the removal of wastes. This intricate networking supports the overall structure and maintenance of the bone.
The other options given such as Haversian canals and Volkmann's canals are associated with the vascular and nerve supply of the bone, and osteons are the cylindrical units of compact bone tissue that contain the lamellae and the central Haversian canal. Therefore, the correct answer to the question of what are the small spaces between concentric lamellae that contain osteocytes is B. Lacunae.