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Nightingale Anatomy Practice Exam

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Compact bone contains many cylinder-shaped structural units called
Correct Answer:
Osteons
Explanation:
In compact bone, the repeating cylindrical unit is the osteon. An osteon is a long, hollow cylinder made of concentric lamellae wrapped around a central Haversian canal that houses blood vessels and nerves. Osteocytes reside in lacunae between the lamellae and communicate via tiny canaliculi to exchange nutrients and waste. The osteons align parallel to the bone’s long axis, giving compact bone its dense, strong tubular structure. Perforating canals connect adjacent osteons and bring nutrient-rich blood from the periosteum, while trabeculae refer to the latticework in spongy bone, not the cylindrical units of compact bone. So the cylinder-shaped structural unit of compact bone is the osteon.

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