Final answer:
Compact bone is composed of osteons, each containing lamellae and a central canal where blood vessels reside, providing essential support and nutrients.
Step-by-step explanation:
The microscopic structural unit of compact bone is called an osteon, or Haversian system. Each osteon consists of concentric rings of calcified matrix called lamellae (singular = lamella). At the center of each osteon, you'll find the central canal, or Haversian canal, which houses blood vessels, nerves, and lymphatic vessels. These pathways extend to the periosteum and endosteum, vital for the nourishment and communication of the bone's cells.