Which statement about central canals and perforating canals is correct?

• A. The central canal runs through the center of the osteon, while perforating canals allow nutrients to diffuse from the central canal to the osteocytes in lacunae.
• B. Because the blood vessels in central canals all run parallel, perforating canals are necessary to connect them.
• C. Perforating canals carry the nerve supply for the bone, while central canals carry the blood supply.
• D. Perforating canals run parallel to the osteon, while the central canals connect perforating canals to the medullary cavity in the center of the bone.

Answer: (B)

Verified step by step guidance

1. Understand the structure of an osteon: An osteon is the fundamental functional unit of compact bone, consisting of concentric layers of calcified matrix.
2. Identify the central canal: The central canal, also known as the Haversian canal, runs longitudinally through the center of each osteon and contains blood vessels and nerves.
3. Identify the perforating canals: Perforating canals, also known as Volkmann's canals, run perpendicular to the osteons and connect the central canals of different osteons, facilitating the exchange of nutrients and waste.
4. Clarify the function of central and perforating canals: Central canals provide the main blood supply within the osteon, while perforating canals allow for communication between osteons and the medullary cavity, ensuring efficient nutrient and waste exchange.
5. Evaluate the statements: The correct statement should reflect the anatomical and physiological roles of central and perforating canals, focusing on their orientation and function in nutrient and nerve supply.