The central (Haversian) canal that runs through the core of each osteon is the site of which of the following?

• A. Bone marrow production
• B. Calcium salt deposition
• C. Osteocyte storage
• D. Blood vessels and nerves

Answer: (D)

Verified step by step guidance

1. Understand the structure of an osteon: An osteon is the fundamental functional unit of compact bone. It consists of concentric lamellae (layers of bone matrix) surrounding a central canal, also known as the Haversian canal.
2. Identify the function of the Haversian canal: The Haversian canal runs longitudinally through the center of each osteon and serves as a passageway for blood vessels and nerves, which are essential for nutrient delivery and waste removal in bone tissue.
3. Eliminate incorrect options: Bone marrow production occurs in the medullary cavity of long bones, not in the Haversian canal. Calcium salt deposition happens in the bone matrix, not in the canal. Osteocytes are stored in lacunae, small spaces within the lamellae, not in the Haversian canal.
4. Confirm the correct answer: The Haversian canal is specifically the site for blood vessels and nerves, which support the metabolic needs of the bone tissue.
5. Relate the concept to broader physiology: Blood vessels in the Haversian canal ensure the bone remains a living tissue by providing oxygen and nutrients, while nerves contribute to sensory functions, such as detecting damage or stress in the bone.