The Haversion System Refers to ________

Question

The Haversion system refers to ________.
A) lacunae
B) lamellae
C) central canals
D) osteons

Accepted Answer

The Haversion system (also known as the osteon) is a structural unit of compact bone tissue in which lamellae (concentric layers of bone matrix) surround a central canal (also known as the Haversian canal) containing blood vessels and nerves. Lacunae (small spaces that contain bone cells called osteocytes) are also present within the lamellae. Therefore, while all of the listed structures are present in the Haversion system, the best choice is D because it refers specifically to the entire structural unit.