Final answer:
In living bone tissue, osteocytes are found in lacunae, which are connected by canaliculi. Lacunae are embedded in concentric lamellae, forming osteons that surround central canals with blood vessels and nerves. Spongy bone contains trabeculae, providing a supportive lattice for bone cells. The correct option is c.
Step-by-step explanation:
The structures found in the circled regions in living bone tissue would likely include osteocytes, which are mature bone cells that maintain the bone matrix and are found in spaces known as lacunae. Surrounding the lacunae are concentric rings called lamellae, which make up the osteon or Haversian system. The lacunae are connected and eventually to the central canal via tiny channels called canaliculi. The central canals, or Haversian canals, run down the center of each osteon and contain blood vessels, nerves, and lymphatic vessels. Finally, trabeculae are the lattice-like support structures found within the spongy bone, also known as cancellous bone, where the lacunae and osteocytes are located.